I would agree that it could be a dangerous situation, but I don't see how it's particular to Crocs. You see tons of people in the parks (and all over) weart those Teva style sandals, flipflops,mesh shoes, etc. I would think the main message is to be careful on escalators - not that Crocs are deadly.

I'm not a huge Croc fan or anything, so I don't really care about trying to defend them. I just think people are missing the point. My little sister had a tennis shoe totally destroyed by an escalator when we were kids, more than 20 years ago. With my little guy, I always make a big game of "jumping" off and way over the teeth at the end while I hold his hand.