When you say "which ones would you go for? The ones hard to catch but pose a threat or the ones easy to catch even though 99% of the population don't care about it" reminds me of priorities that win battles but lose wars. I hope you remember your quote the next time you're a victim of noise pollution, a real urban issue I wouldn't wish on anyone. It sounds like the reply an unsympathetic cop or politician would make hearing you complain about an asshole neighbor with an effing boom-box and a barking dog in his car 24/7/365. Who cares, it's only you. That's how we end up reading about otherwise "nice neighbors" who go berserk on the clueless inconsiderate assholes who get no abolishment from the police for their terrible demeanor and behavior. You either enforce all the laws all the time or wait for little disasters to become big ones. Happens all the time.