Yeah, it probably is an accident/safety thing. I dunno... I just don't like it. So even once you've stopped they can't unlock the door themselves? What if you have adult passengers?

I don't think our kids could reach the door handles from their seats, so opening while going along wasn't really an issue, and DS has never tried it since being in his booster. And we just told the kids to wait for us to open their door before they get out of the car. Has worked for us so far (can't speak for DD2 yet lol.. she might be the one to make me use child locks!)