They say, "" Well, that's impossible, that can't be. "" And the line of argument, if you ask parents, is, "" But car seats are so expensive and complicated, and they have this big tangle of latches, how could they possibly not work better than seatbelts because they are so expensive and complicated? "" It's kind of an interesting logic, I think, that people use. And the other logic, they say, "" Well, the government wouldn't have told us [to] use them if they weren't much better. "" But what's interesting is the government telling us to use them is not actually based on very much.