This is why I ride first class in a private room. But still sometimes the runaway kids get in there too. One time they stopped up all the toilets with soap bars and rolls of toilet paper and whatever else they could find to throw in it. I applaud the conductor that put that lady off in Dallas. They should do it more often. Kids having fun on the train is one thing, out of control kids is something that should be taken care of by the on board staff. I sometimes walk through the train just to have a look and the coach section is usually a mess, particularly on overnight trains.
I think everyone just has different ideas about what is "acceptable". My very best friend has let her kids run amok in many places. I get embarrassed and it makes me uncomfortable. However, she is also kind and patient with other wild children and just accepts it as kid behavior and moves on!
I can't even count how many times I have "entertained" other peoples kids in hotel pools, movie theatres, etc. Mom (or Dad) is relieved that someone else is keeping their kid occupied and just lets them be. It is fun sometimes to visit and ask questions, but I mean I have had kids just follow me around