Oh lordy.
Some kids. The not normal ones. In my -by now fairly extensive- experience, most could give a flying fuck what happens to it. Which is why they don't see any benefit of wasting all that time using the potty when they can just do it where they are in what they're wearing
In fact one of the most succesful methods among my peers in the UK was leave 'em nekkid. Many kids don't like the feeling of it trickling/falling down their legs, so if the potty is the only alternative to that they will use it. But put underwear or diapers on and there's a barrier to "soften the blow" to they go in what they're wearing. But there seems to be a much bigger taboo here about having kids run around butt-nekkid -especially outside, so that may not be such an easy option. I guess the yards aren't so private and the tempertaures less nekkid-friendly for longer periods.