How many children have to die before you give up your guns? They will never stop saying this. Why would they?
All of them.
And I want my cake back - ALL of it.
A few years ago there was this game where some ridiculous moral dilemma was proposed and you had to describe what you would do. Like: You are trapped in a mine with another person. Not enough air for the both of you to survive before rescuers arrive. Other guy takes a sleeping pill and says you decide what to do. What do you do? In general I would propose the most brutal self serving solution I could think of without hesitation or moralization. In this case with no pondering or contemplation I would say, "I'd kill him." People really didn't like me to play the game.
So with that as a model, my answer to this stupid question is, "All of them."
The answer to that question is “a lot less than number of children that will die is a disarmed populace”.
For proof, see the 20th century and Venezuela today.