In terms of the police's use of military equipment, no department is using mortars to take out suspects. Police get military equipment like vehicles and vest for much cheaper than usual because they buy military surplus.
Actually it doesn't. Police have proven to be ineffective at solving the issue of crime. The places with the most crime also have the highest concentration of police officers. This actually makes crime worse, as police are known to target minorites and escalate conflicts, due to the lack of accountability. In fact, the so called crime wave from abolishing the police occurred mostly after police had been restored, as in classic Democrat fashion they backtracked on their promises. They also failed to redistribute the police budget to social welfare, public works projects, and healthcare. Things that actually help solve crime by lifting people out of poverty.