Yes, a police force will always be necessary for the most basic protections of liberties, because there are always some people who cannot follow the rules. Without police, there is only anarchy. Police are important for protecting private property rights and making sure that people are free to do the things they want to do.
No matter what type of government you have, an effective police force is always needed. It is human nature to push boundaries and break laws when it is advantageous. A police force is always needed to protect the public and enforce laws that the government puts in place. However, you must always make sure that the police force is conducted with fidelity and moral correctness.
Even for basics it could cause them to take advantage more then they already have, for example Freddie Grey was killed from police force. I strongly disagree with police using force because if it continues to happen it could push to further levels and police wont just be killing african american young men, but young children of all race.