This is cowards talk.

You speak of two kinds of people, "normal" people and "dangerous" people. This ideal is misinformed and naive. It is a fearful ideal. There are two things that you seem afraid of:

The unchangeable truth that nothing you do on this will make you truly safe as long as you walk this Earth. You are afraid of the fact that at any moment someone could walk up to you and pull the trigger. A human being with true courage would disavow the desperate attempts at safety that only result in despotism and harm and open themselves up to the self sacrifice of being harmed by the violent exception.

The second thing you appear to be fearful of is the duality inherent in man. Every one of us has within them a savior and a killer. If our environment pushes us far enough all but the most stoic among us would turn to our neighbor and slaughter them for our own preservation. You seem to be afraid that deep within yourself, you know that if pushed with enough force, you too would be a man with a gun, sticking people up for pocket change.