Most of those hostile designed benches to keep homeless people from sleeping in public? They are usually just regular benches with the bar in the middle attached later with a few hex nuts and bolts, not welded. In other words you can get them off with practically any wrench that fits. I have been liberating my parks in my city all day now. It takes maybe a few minutes per bench. The only problem is finding a place to dispose of the junk bar when you're done without loading trash cans past capacity. Anyway, it's easy, it's helpful, and it's praxis.