It has been ZERO DAYS since some GPL'd software made me "agree" to the GPL while installing it.

The GPL is not that kind of license: You don't need to agree to it. Agreeing to it changes nothing.

This just happens because installers have a premade "license" page and the GPL license seems like a natural fit.

But there's no point: You need to notify the user the software is GPL, but that's all.

@foone

5. You are not required to accept this License, since you have not signed it. […]

@lnl @foone to be fair,

However, nothing else grants you permission to modify or distribute the Program or its derivative works. These actions are prohibited by law if you do not accept this License.

By not installing unless the licence is accepted, it's preventing users from shooting themselves in the foot and putting themselves at legal risk. However, users should have the freedom to shoot themselves in the foot if they so wish.

Edit: never mind, the acceptance is explicitly stated to be indicated by modifying the software. I take this back.

@TerrorBite @foone shooting how? The licence doesn't put absolutely any legal requirements on someone just executing the code. (This is not a legal advice)
@lnl @foone Yeah, after looking deeper I'm retracting this statement.