Just because someone experienced a life event doesn't give a parent the right to not be a parent, you don't stop being a parent because you are having a hard time. It doesn't excuse the parent from correcting their child's poor behavior, and while yes there are children who have disabilities most parents I know who have children that have a disability attempt to redirect their behavior or correct it and just don't stand there or sit there like a bump on a log. It's the parents job to take care of their kids in situations that may be upsetting for them. Heck I'm sure if the parent had said "Oh i'm so sorry," or some kind of acknowledgment that she realizes that her children are behaving incredibly poorly.
There is no excuse for poor behavior, and I wish people would stop trying to excuse it because no one wants to take responsibility for someones actions.
I came back home late last night (from WDW, of course; DS was at home with DH and started running a fever yesterday morning. Won't break, and now there's vomiting, so we're off to urgent care when they open, as his pediatrician is on vacation for the next 2 weeks and we can't get in to the cover doc).
Anyways, there were kids running all up and down the walkways outside our room at POP (end room near the stairs, by the playground) yesterday afternoon. There was some rain, and maybe a bit of thunder going on. But these kids....not sure if there was a herd of them or if they were just running and stomping heavily, but they actually shook the window! Running up and down the stairs, running on the different levels of walkways, and not an adult voice in hearing distance. Plenty of screaming, though. At least one kid in tears during the two hours this was going on.
About 30 minutes later (when I was this close [ ] to calling about them, I hear an adult yell "Time to come in" and the herd ran off. Quiet resumed, and then my grandson woke up when a loud laugh track came on the tv.

slept through the herd, woke up to a laugh.
There was no one telling those kids to stop running on the walkways, or to not jump off the stairs, or to stop screaming; and that irritates me. I get hating being cooped up due to weather; we were stuck in our room in 2011 due to severe weather over a 24 hour period. That still doesn't excuse not parenting, though.
Maybe I'm just old, because I raised my kids to not run down walkways/hotel halls, and to be quiet outside other people's rooms. Just like when we rode the bus (in Colorado, I didn't have a car for 3 or 4 years, and we took the bus everywhere). We sat and talked quietly or read but we did not shout or make messes.