Not entirely. There are people at the boarder searching some cars that come in, and searching some mail. Laws could be passed increasing those searches, and even searching everyone's house regularly. This would reduce the risk that you get shot, because some illegal guns would be found in these searches.

To take it to the extreme, the law could force you to live in a little cell locked away from everyone. This would prevent you from being stabbed by someone else (except one of the guards).

Like I said, there's a tradeoff between security and freedom.