The Japanese Sarin Gas Attack took a team of 10 people and the relatively complicated procedure of making sarin gas, and it killed 13 people and injured 50. Pretty much the same casualty rate of one guy armed with a credit card here in the US...Mass murder will stillhappen, look at countries that ban guns... when someone wants to kill MANY people at once they find a way, I am not saying they will go ape**** and be superhuman killing everyone with a knife.......... They will do some research and make bombs.
Bombs are illegal to my knowledge yet people have those too...... See the point, you cannot just make guns go away.... again no perfect answer to any of it cant take them all away, but cannot give to everyone.... So what the **** do we do, answer is who ****in knows