Originally Posted by
noglider
I have never heard of a bike theft motivated by disdain for bikes or cyclists.
I still sometimes travel without a lock. I run into a store occasionally, and leave it out. Before I do that, I sabotage it by undoing the QRs on the wheels and sometimes the brakes. I push the shift levers forward so the bike will shift when pedaled. Of course, it's important to remember to undo all that before I ride away.
I like your idea of "sabotage"! Of course the paranoid side of me would be worried about the would-be thief injuring themselves and promptly trying to sue you...
As for the stuff Tom was talking about, I went to college with a kid that was into random acts of vandalism and destruction while drunk (which I didn't and don't condone, and which was indeed rather disconcerting). An unlocked bike would have a tempting target for mischief...