Indeed. Knives just don't run off on their own stabbing everything in sight, pillows don't flop down on people's heads on their own, and baseball bats don't swing at people's heads all by themselves. We need to look at what the issue is, how firearms do all this all on their own.
Or perhaps do you think maybe the US has a higher mental illness issue than where ever you are? As I said, lets keep talking about the gun and not the person with the gun in their hand. 80 million others did not shoot someone today in the US. Firearms are completely inanimate. People are all individuals with individual thoughts (well, mostly. A lot of parroting going on here.)