I think that's just our parenting style.
I've always heard that the more kids you have the more relaxed you become about following the rules.
If this is true POOR COCO!
We started out as pretty relaxed parents so allowing a 3 year old to push a 4 month old as fast as he can around our dining room and kitchen in a cardboard box didn't seem like that bad of an idea.
I mean is it really that different than a stroller?