We are aware that we are expected to always be professional. Curiously, it seems that we're seldom, if ever, expected to act like human beings.
When you let your bad day affect the way you treat an individual, then you are not doing your best. This has nothing to do with being human or feeling stressed, pressure, anger or anything else.
I have nothing againts police officers. My best friend and his brothers and Dad are all in law enforcement. Some of my best buds in service are in law enforcement. They all leave their personal problems behind when they are on duty.
Let me ask you this, have you ever had to perform CPR or any lifesaving measure on a BG after they have shot at you or your friends?
You're personal life can be all messed up but when your profession is to protect the public, you can't let it affect you. You stay professional.