When a police officer violates public trust and does something illegal, he/she needs to be punished severely for it.

Not just lose their job or 2 months paid leave while the police department investigates. In the first place, the investigation needs to be done by the state, not the local police. Here in Georgia, the GBI have started investigating all shootings involving cops. The state of Georgia recognizes that people are losing faith in the police and if people are to trust police, the state has to ensure they're not violating people's rights.