Do you believe that, because you did it, anyone can do it?
No, I am aware that some people can't "do it", to very meanings of "it'. Some people can't get the promotion they think they deserve, some people can't get a job, some people can't live independently, some people can't speak, some people can't... and so on. Such is life, we are all different.
What would you say to the person who gave it everything they had and simply can't do it? Is it just the luck of the draw? Survival of the fittest? The way things are?
Yes. Except for 'survival of the fittest', I find it annoying when people use the term in a non-evolutionary context. I am a relatively lucky person (born in a first world country with free education and health care, born to intelligent, well educated, upper middle class parents, of above average intelligence myself, have stumbled into some excellent opportunities over the years etc.), in some ways I'm a relatively unlucky person (dyslexic, autistic, struggled with severe depression and anxiety most of my life, etc.). We are all born with a certain amount of advantages and disadvantages, it's what we do with them that matter. And as for it being "the way things are"... well yes, obviously things are the way they are. That doesn't mean the way things are is the way I think they should be, but all the optimistic ideals in the world aren't going to change reality. At least not right away. Things have massively improved over the past 50 years for people with disabilities, and they will continue to improve... slowly.
What is your opinion of people who cannot provide for themselves and need others to help them do it?
Everyone needs help. Some more that others. I don't really have an opinion, it just is the way it is.
For those of you who have said it should be a compromise (and haven't answered already): what do you consider a "reasonable accommodation" that NTs should extend people on the spectrum?
Well, understanding is important. As for specific accommodations, that would vary far too much from person to person to give specifics. For myself, I benefited from the "two ticks' system (when two ticks employers offer interviews to all qualified disabled applicants). I like to think I would have got an interview for my current job either way, as I am highly qualified for it, but who knows. I requested a quiet office, and got it. I requested to have weekly meetings with my line manager to discuss what I would be doing in the next week, and got it. I would love to not have to talk on the phone or give presentations (I am sick after every single presentation I do and talking on the phone leaves me anxious for hours afterwards) but these are vital parts of my job and asking to not have to do them would not be reasonable.