last statistic i saw about gun deaths in the US was the majority was suicides.
suicides as well as murders will happen anyway, people will just use other tools.
otoh, guns are about the only effective means of self defense against knives because they are distance weapons and knives are real killers.
gun control means that the population is defenseless against any attacker. bad guys will have them anyway (cf. europe) and an armed population means attackers likely will be shot in the process.