A police officers job is to serve and protect. Not to serve and protect and to beat up people they don't like or to serve and protect the people who make the most money or the people who dress well or the people who look the most like them , or think like them.
The police should be terminated for physically assaulting citizens. This is because some police have made it a habit. They aught to be terminated to give them discipline. This should also serve as a warning to the rest of the police to ensure they treat the citizens in the right manner.
Police officers exist to protect and serve the people. There are very few circumstances in which physically assaulting citizens would be justified and in line with that purpose. Police officers need to be held accountable and be shown that they are not above the law. Police officers themselves need to speak out against their fellow officers who have physically assaulted or shot citizens unjustifiably, and the rest of the citizens need to do so as well.
Yes, police should be terminated for physically assaulting citizens because their job is to protect. If they are caught doing something that might harm a citizen, they should be fired and face jail time. We are supposed to trust police officers, and if they do not do their jobs, we cannot trust them anymore.