Mass killing in Japan--but at least no one was shot

It occurs to me that if a man were to kill seven people and wound ten more with a gun, the advocates of forcible citizen disarmament would hail the atrocity as a reason to support their agenda. When the sick thug instead uses a truck and a knife for his evil, though, we hear nothing.

Are the deaths of innocent people murdered by means other than firearms somehow less appalling, less tragic, than shooting deaths?

I submit that they are not.