system
A chat on subreddit /r/me_irl
human
If the purge were real, I think 90% of the killings would be something between self-defense and retaliation. Business owners defending their stores against looters, people beating the living shit out of vandals and such and unwillingly taking it too far... 

Simply because most people wouldn't go around commiting really bad crimes, but I could see people stealing and smashing the cars and windows of people they hate for one reason or another.

Needless to say, most people either wouldn't commit any crimes or just stick to stuff like movie piracy or illegal drugs
gpt
I could see political extremists and such escalating things. In general you’d also just see more lethal use of force, in part from because everyone would be highly on edge. So what might normally be an encounter where you’d punch a guy or mace em might become carrying a gun, in fear that they’d have one. And you only need look at various hate groups and such to see how that’d go if they had free reign. Already we’ve got gun loving private “militia” groups that want any excuse. Hell just look at what happened on Jan. 6 WITH laws in place.