Interesting to see this incorrect line of reasoning about risk laid out so explicitly.

If you're around people who do extreme sports with serous risk, you'll know many people who have this attitude and you'll also know many people who incurred life-altering injuries or died because of this attitude.

A friend of mine who's reasonable and has a higher risk tolerance than me used to paddle with a group of whitewater kayakers who were doing the hardest stuff. 4 out of 7 of them died. She says

the reason she's still alive and so many of her compatriots are not is how she thinks about risk.

People would say things like "there's a 99% chance this will be fine", where "not fine" is fatal and they would then run something that had a 99% chance of working out. She wouldn't do that because, of course, if you regularly take a 1% chance of death, you're going to end up dead unless you're extremely lucky.

Another one is that she would never run something she hadn't observed before, whereas

most people around her would, using the same reasoning as the above. But if you do that often enough, you're not likely to live.

She has a similar attitude when backcountry skiing and would never take a drop of more than a few feet without having inspected it first, which is why she's never been seriously injured in the backcountry, but she's had to carry a partner back who landed on unexpected terrain and broke both legs, a rare occurrence per instance but not unlikely in the long run.

She is also not dead after many years of fairly serious mountaineering where partners would be extremely upset that she wanted to turn back because she thought that were a small chance of weather that would cause an attempt at summitting to be fatal.

If you're around a lot of mountaineers or other people doing high-risk activities, you'll hear about deaths every year because the cumulative impact of summing up small risks is counterintuitive and default human intuition for this is wrong.

@danluu I think people are not so much bad at estimating these things as just talking themselves into doing very risky stuff because otherwise many of the things they want to do are impossible.

@samth If that's the reasoning, that also seems wrong to me because being crippled or dying really puts a damper on both skill development and future chances to accomplish something, e.g., if you look at what people are doing in whitewater today vs. 20 years ago, people are now doing stuff that would've been considered impassable 20 years ago. It would've been more effective to not take fatal risks.

And for things like blind drops / runs, there's no upside in terms of what you can accomplish.

@danluu Sure, but (a) if you're 23 and want to accomplish something big "wait 20 years" doesn't really work. And (b) for some things like base jumping or alpine-style mountaineering on big mountains accceptable levels of risk aren't really possible.

@samth I think that could be true for mountaineering in some cases and some other activities that have a high degree of inherent risk (free soloing is certainly in that category), but I'd still say that, for most extreme sports risk, if you look at where risks are coming from, most of it is on risks with no upside.

It's possible my sample here is highly skewed and and I know people who take more pointless risks than in general, but I would guess that my skew is in the opposite direction.

@samth E.g., with surfskiiing, almost every death could be prevented with mundane standard precautions (have VHF and a beacon, carry a backup paddle, have flares/smoke, etc.), but relatively few people do these things and people die all the time.

Locally, there was a woman who carried all this stuff and was (kindly) made fun of for having her "girly bag" of safety stuff until she had a near death experience that would've been fatal if she wasn't prepared.

@samth Now, locally, guys who are out in big conditions also carry similar equipment, but there was never a reason to not do it in the first place other than people saying "it will probably be fine" in an environment where people have been dying for the same mundane reasons for decades.

At the absolute limit of what a human can do, someone might die because they're doing something that can't be done at low risk, but most deaths were and are preventable in boring ways.

@samth Also, if a significant fraction of risk taken were by people who were doing things with high "inherent' risk, then you'd see that in postmortems, but I've read a ton of postmortems in risky activities that I do and they almost all read like https://mastodon.social/@danluu/109360584113899157.

People generally die due to taking multiple combined risks that have no significant upside. Even if there are a few people who die because they're pushing the limits of what humans can do, that's basically a rounding error.

@danluu @samth What stands out to me about that story is that they had a safety escort but they don't seem to have had a clear plan for what the escort should *do* the event of an emergency.

@nat @samth Yeah, that's sadly common. My guess would be that the (implicit, undiscussed) plan was that the escort could help with an assisted remount if the less experienced paddler had issues, but of course that requires the boat to be seaworthy and attached to the paddler.

Another risk would be that conditions degrade enough that the person can't stay up, so an assisted remount doesn't help because the person immediately gets tossed when they start paddling.

I was reminded of this thread

@nat @samth because someone passed me the collection of postmortems reported to AW for H2 2022.

Consistent with the above, zero deaths from people pushing the limits of human capabilities and roughly half from people who didn't take the most basic precautions (no PFD and/or alone in potentially dangerous conditions).

Also notable are the two commercial raft fatalities, where it's sort of out of your control and you're rolling the dice with order 1/100000 chance of death and 1/100 of injury.