Because we always wait until some crazy bastard kills before we put him away.
How many are killed by drunk drivers?And how many of those drunks have a rap sheet of dozens of convictions? Are they not just as dead as the gun shot victims?
If a person is killed while crossing the street it never makes the papers outside the town where it happened, but if a plane crashes killing 100 people it is on the national news. Are they deader than the man?