Very debatable. If you as a non-LEO attempt to detain someone who you suspect of having committed a crime, and they feel threatened, you could easily end up in jail.
“They did a crime” does not, in fact, give you the right to crime too.
Edit: Can someone help me out? I’ve posted a bunch of controversial opinions in this thread, so why is the one factual claim the thing getting downvoted to oblivion without comment?
Am I somehow wrong about this? Like... can I actually crime someone just because they crimed someone else first and I don’t want them to get away with it?
I need to know this.