Fucking with grocery store price tags is a solid way to get arrested. Sorry, artists don't just get free rides to do whatever they want to spread their so super important message.

And during an actual war is the exact time you don't want to be arrested for being anti-war. Everyone will in fact fuck with you because you've made yourself an open target, from guard to inmate.

Based on this single image as well, this is likely a generic artist who never faced consequences before anyway. Which means most of this "treatment" is likely blown way out of proportion and they are just whiny.