Exactly - if it was such a big deal it was worth allowing for some delay or problem by adding a few hours onto the journey, going the day before etc. It goes tits up and someone / anyone else is expected to wave a magic wand and make it all better. Which sometimes isn't possible.
But a headline such as 'Parents Fail to Plan Adequately for Disabled Childs Day Out' or 'Group Didn't Allow Enough time to Get Children to London' don't really have the same sort of impact do they?