I don't think anyone is suggesting that Cameron's wealth would have made Ivan's death any easier, for goodness sake. Day to day life would be very different, though.
Neither of my boys are as severely disabled as Ivan was, but yesterday, I was stripping off a very wet muddy boy after he came in through the front door, having followed a life long compulsion to traipse through wet mud, whilst the other boy was in the bathroom, stripping off a dirty nappy and spreading poo everywhere. I'm fortunate enough to be sufficiently solvent that we could afford to write off the 2 week old £40 (supportive, by necessity) trainers, if they don't recover from their soaking as well as everyone's toothbrush - I am fully aware that many parents of children with disabilities are financially very squeezed and would be hit very hard by that. If I had the sort of wealth where I could afford nannies, I would only have had mud to deal with and not poo.
As for Freud, he's a clueless eejit and Cameron should have been mortified that a one of his ministers expressed such views about people with disabilities and MH difficulties.