That's assuming the child really doesn't have a choice. First of all, if I give a child a choice then I will accept the answer they give. I will try to persuade them of why it is good to go before giving them the choice, and I would express disappointment in a mature and reasonable way if they choose something that I think is counter-productive, but I wouldn't lie to a child about their choice. Children are much smarter about that than a lot of people realize.

But in some things, they don't have a choice. They may _really_ want to run into the road; I'm not going to allow it. They probably don't really understand, and I've got a responsibility to protect as a parent or guardian. Where is the line? Not sure; I think that's part of the art form called parenting.