Just repeatedly attack their locks with superglue. Any and all locks. A glued lock is absolutely demoralising. You need to remove and replace the lock; cleaning solvents wont do a good enough job to properly free all the pins/mechanisms. Lock protectors get glued too lol. Nothing is safe from sticky bandits. It only takes a squirt or two... And it is very easy + legal to carry a tiny tube everywhere. I'm not condoning this lightly, I am respectful of property and hard work of others and all that... I'm providing a real strategy to replace the questionable ideas I see scattered around with something that is low risk and highly effective. P.S. be aware of cameras. Hide your identity, distort your body size, alter your gait.