In all of those cases I’m pretty sure you can’t in fact be arrested just for the act as described. You need to be in some way negligent or malicious in doing so

In all of those cases I’m pretty sure you can’t in fact be arrested just for the act as described. You need to be in some way negligent or malicious in doing so, and in most countries at least you have to be extremely negligent to get prosecuted for anything done while rendering aid to an injured person. Even more generally, some form of harm needs to be shown to prosecute. Unfortunately there’s an increasingly broad definition of “harm”, at least here in the UK, but for now you do have to really screw up in any of the cases you’ve listed.