I am for shooting trespassers/squatters m. Had it happen to me and I had to evict rather than have these parasites arrested.
A shame.
Saw a story where a building owner enraged the renters by asking for back rent or else. He came to check up later and the front door was missing.
There were drain holes in the floor where toilets had been ripped out, pipes where the sinks used to be, cables hanging down from ceilings, floors and walls gashed and splashed with paints and motor oil.