IMO DC is using his specific experience in caring for his son Ivan and unrealistically applying that experience to everyone that has a child with disabilities. I feel that he does not think (nor make the effort to educate himself) about the vast differences that people in other circumstances (especially financial) are experiencing and therefore comes across as unfeeling about people with disabilities, perhaps because he simply does not apply the logic that other people's situations can be much different.
I also think that as he has (sadly) not had the experience of his son growing to adulthood, that he does not realise the scope of failings in the support available to those in the young adult age group for disabilities. I suppose that it's possible that even had Ivan grown to adulthood that, due to his finances and privilege, DC may still not have understood the differences because he has not directly experienced the level of financial struggles and battles with the NHS that many deal with regularly. Obviously that is something we will never know.
I don't like to see him using his personal experience as a carer to halt what may be beneficial to others who are still in a caring capacity or those who are in need of support. The very fact that he was a carer/parent of a child with a disability should encourage him to want to educate himself further in what type of struggles people in this situation are having and find ways to help and support them. Sadly, this doesn't seem to occur to him.
One would want to think that being a carer for his son would teach him that every life is important and needs care and support. Sadly, this doesn't seem to have occurred to him either.