Other people's poor planning is not your emergency. That doesn't mean you don't go the extra mile to help, necessarily, but it's a favor, not an obligation. Maybe you do, maybe you don't, depends on how you feel about the people involved and whether they deserve the help.

If they don't get that, yeah, leave, will a smile on your face and a song in your heart. The only reward you'll get for staying, if they're not the sort who appreciate the above, is burn-out and more of the same crap in the future.