I just want to point out as food for thought that adults and teens can have hidden disabilities too. I have visited DLR with an adult who often needs to leave lines suddenly. Because we have both had the luxury of visiting the parks multiple times, we generally just all leave the line when it happens, even if it means giving up a FP. If it were a once-in-a-lifetime trip, and we hadn't known to ask for
DAS or how to utilize FP to avoid hour+ waits, it might be a different story. Certainly some people do cut in line intentionally. Maybe a lot of people do. But honestly, for me personally, it's just less stressful to give everyone the benefit of the doubt than to try to figure out on a case-by-case basis who to be angry with. If I saw obviously intentional cutting it would be hard not to be annoyed, but off the top of my head I can't think of any instances that I've seen that at DLR.