Bombing places was the go to before the assault rifle ban was lifted in the US. Crazy people will always find a way to kill innocent people, but giving them access to weapons that make it so much easier is just plain stupid. Red flag laws and mandatory waiting periods help, but aren't the solution.
It's like the argument that "guns don't kill people, people kill people." Replace the word "guns" with "bombs" and it suddenly sounds as stupid as it is.
Or that "Europe has an issue with people stabbing people in crowds, should we ban knives too?" Yes, people are the main problem, but nobody wants to admit that we really need to start looking after one another more than we do.