Admittedly, it's not a great example, but maybe it can facilitate understanding a bit? Why do we take away the right to drive a car (free movement) from those

Admittedly, it's not a great example, but maybe it can facilitate understanding a bit? Why do we take away the right to drive a car (free movement) from those who are intoxicated? All that banning of drunk driving does is it slightly decreases a nonzero probability of risk. The risk to be hurt by an intoxicated driver is very low, and the risk to die is even lower. If people are really concerned about street safety, and traffic is inherently dangerous as it is, they should just stay at home.