You're joking right? Every one in a police uniform is a good guy? According to your "logic", you can tell that undercover agents are bad guys. No uniform/have gun. Everyone who has a gun and no police uniform is a bad guy in your world? The question is'nt really how am I going to tell the good from the bad, it's how are you, a confused person, going to tell the good from the bad. Every tax payer should be issued a gun and required to carry it. Unless... they are mentally ill or found guilty of violent crime. An armed society is a polite society. BTW, It's difficult to understand your comment without the proper punctuation and syntax. Go back and get an education.