If it turns out that most of petty crime is committed by “disadvantaged” (whatever that means) populations, then the enforcement will necessarily also impact the “disadvantaged” populations the most, and some people don’t like the idea.
As opposed to letting them commit crimes which in turn will never give them a chance to be less disadvantaged? This reasoning makes no sense. These are people that need help, letting them act unchecked will certainly not provide them with the assistance and re-qualification required to be reintroduced in the society.