"Why don't disabled people just make an extraordinary effort every day? If he can get out of bed for his grandson for one day then clearly he can always do it!"

This is you, you're the person that tells people in wheelchairs with limited mobility that they're faking it because sometimes they can walk a bit and sometimes they can't. The reality of disability is more complicated than just being completely incapacitated all the time. There are good days and there are bad days.

Not to mention that the point here is that it's literally a miracle. You people accept magical flying elevators and people inflating into beach balls as miraculous but conveniently forget that when it comes to shaming the poor or disabled for managing to get out of bed for one single day.