The police could not exist if most people refused to help them. Arguing for people not to help the police is therefore arguing for the police to stop existing or to become less powerful or less effective.

I take "not helping" to mean not just not developing specialized products that only police can legally use, but also not calling the police in case of crime, not helping them with investigations as witnesses. Where the law permits, not selling them generic products and services (eg food). And where personal circumstances permit, not working for a company that does business with them, deplatforming them, etc.