As a species, we are a judgemental bunch. This internal conversation became easier to me when I flipped it around a bit. If someone random person described the situation, would I feel they were abusing it? If yes, then it wouldn't be fair for me to request anything special... but if I would feel like that person needed the extra hand, then I shouldn't feel guilty about having it either.
This also helped when we did get my son a DAS for some lines he has serious problems with. It let us look at our other kids and say "this one is a fair use but booking every thrill ride in the park back-to-back while we go through other lines/rides between DAS rides is not." Even if it's technically allowed, we kept ourselves within some moral guidelines. It might be needed for some, but the pass is also very overpowered for most which is why so many hem and haw so much about whether it seems right. But anything that you would think sounded reasonable for others to use it for is reasonable for you to use it for.
This also helped when we did get my son a DAS for some lines he has serious problems with. It let us look at our other kids and say "this one is a fair use but booking every thrill ride in the park back-to-back while we go through other lines/rides between DAS rides is not." Even if it's technically allowed, we kept ourselves within some moral guidelines. It might be needed for some, but the pass is also very overpowered for most which is why so many hem and haw so much about whether it seems right. But anything that you would think sounded reasonable for others to use it for is reasonable for you to use it for.