They can still disagree. But, while we are disagree'ing, they cannot impose their views upon me.
But you've just imposed your views on them. They think your "privacy" is less important than their (and their children's) "safety." And you've just deprived them of the right to expression of that view.
Please understand, I happen to agree with your view. And I understand the danger of allowing their view to be exercized: the images captured and the information learned can not be unseen and unlearned.
But to say they can't impose their views on you is not a sound argument, as you are proposing instead to impose your views on them.