It is obvious enough that there are some out there better than we are at everything. This is something I find in everything I attempt much to my annoyance. Yet it is still necessary for me to do something with my life so what should that be? Among the things that I could do I should be doing the one that I am least bad at – the comparative part of the advantage is among the things I can do, not in relation to what others can.
That is, if we all do what we are least bad at then production will be as high as it can be and we are all, in aggregate, as rich as we can be.
So, those who are differently abled in that modern sense, what should they be doing? Their abilities might be different, yes, they might even be lesser in every manner than others, but their decision is still just as with everyone else. They should be specialising in what they are least bad at just as the rest of us should be. Different skills and talents, OK, but equally human and facing the same life questions as the rest of us.
We have that 30,000-foot view then but one of the advantages of belonging to a culture, a civilization, is that we do not have to work through every question we face in our lives from first principles. We have that system of transmitting through the generations the lessons our forbears worked out the answers to – that is what a civilisation is. Or, of course, in this era of globalisation we can steal the answers from those who worked it out elsewhere.