Cambridge Police are too busy with serious crime
Anyone who lives in Cambridge will know that Cambridge police are far too busy dealing with serious crime to deal with minor stuff like "walking on the cracks in the pavement (more than once per day)". Their approach to (e.g.) cycle theft has been a bored shrug for years, so I confidently expect the same response. Curtain-twitchers will get the thrill of filling in a form, the police will send them an email thanking them for their help, and nothing will happen. Everybody wins.