One principle I’d like to be enshrined in law:

If you create incentives that reward a behaviour, you can (and will) be charged as an accessory in any case where someone is doing something illegal as a result of optimising for that behaviour. An affirmative defence would need to demonstrate that you had safeguards in place to effectively disincentivise that behaviour.

For example, if you are running a delivery company and you set targets that mean people are paid more if they drive or park illegally, you are automatically charged as an accessory to however many counts of dangerous driving your drivers are charged with. If you are a city councillor and vote to close all of the public toilets so that there’s nowhere for taxi drivers to relieve themselves, you can be charged as an accessory to a few hundred counts of public urination.