Unfortunately, many people with special needs and their families are often in a position of not knowing what to expect. Will their conditions get better or worse? Will they be able to get the medical help they need or not? Will this new treatment be effective or won't it? Not knowing can be very stressful.
But different people react differently to stress and perhaps the difference depends at least partially on attitude. Expecting the unexpected can become the norm, in which case not knowing what will happen can be easier to deal with.
Maybe it works sort of like physical exercise in healthy people; repetition increases strength. After all, most people with special needs and their families have already dealt with things that would seem overwhelming to "normal" folks, but many of those things have become just another part of everyday life.
In weakness there really can be strength.