People are capable of committing crimes regardless what clothes they wear.
If I don't know you personally, I don't trust you. It doesn't mean I won't respect you, just that I won't unquestioningly place my life in your hands.
There is one other person on this planet I trust with my life. You are not that person.
Also, I don't really feel like I "fear" cops or criminals or anybody in particular. I fear that crime may be increasing and it concerns me. I fear that the founding documents of this country are ever so slowly being eroded and it concerns me. I fear no individual unless they are in the act of trying to do me harm.