Cosby, especially, should understand this concept: his son was killed with a handgun while minding his own business. He was an exceptionally intelligent and gifted young man, killed by a punk who wanted to rob him and his friends.
Those who would disarm the population ignore the fact that evil people exist in the world. Most people are good people, but to ignore the fact that evil, including evil people, exists is dangerous folly.
Certainly Cosby speaks from painful experience. His loss is understood by all good people who have children. It's a loss that one can never fully recover from. I do understand. I understand how overwhelmingly tragic this is. I have children, and I know what Cosby's tragedy means.
But it would make the tragedy even worse if innocent people were rendered helpless to protect their children because of it.