Just sent that poor misguided youth a letter....here 'tis.
How about 'si vis pacem, para bellum'? I like that Latin phrase. I like yours too, but it seems a little...misdirected to me.
You see, I am also the people. I am an American from Greek parents. I disagree with anti-gun legislation that takes away a good citizens right to defend themselves.
By disarming 'good' people, you are just enabling the 'bad' people. I'm sorry about the violence you witnessed and I hope that one day you can come to reasonable terms with it, but, laws against guns, bullets, etc....are not listened to by those, forgive the pun, that you're aiming at.
Criminals by definition, don't listen to laws. The only people anti legislation hurts are those that are law abiding.
Ask a criminal in jail if they're scared of the police or laws aimed at them. Now, ask them if they're scared of a potential victim that they thought was unarmed.....
Good luck....Molon Labe!