I have a 20 month old and we've been at XP several times for play dates and also birthday parties, my son is still little to climb by himself to some of the equipment so I or his daddy usually assist him and we are always very careful not to get in the way of the other children playing, I think before making judgments about who should or should not get on the equipment you must understand the circumstances, sometimes older kids are the actual danger and parents doesn't ever bother to control their kids when they are acting like maniacs around younger children. I do agree that adults climbing and bouncing for no reason than their own amusement should be talk down from the inflatables.
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