Ward 1, Here is my list.  #1. Mental Illness.  #2.  Marijuana, Hash Oil,  Meth, Heroin, ask any Druggie that has been convicted and in prison for a few years and they will tell you that Marijuana is the gateway for people to start using  the other hard drugs.   #3.  Alcohol.  These three together is a LETHAL COCKTAIL and it happens daily.

GUNS are NOT the problem.  

Here is a dirty little secret that most people do not want to accept.  The greatest threat to any VEHICLE owner is their own VEHICLE.  Look at how many people kill people with their cars and trucks.