I have all the same initial reactions as many others on MN regarding Harry i.e. whiner, grifter, stupid, entitled etc and it's easy to dole out the criticism.
However while I wouldn't say I have sympathy for him, as so much of his situation is of his own making, I actually do have some underlying feelings of concern for him and his future (and children).
He reminds me an awful lot of a relative of mine who is neurodiverse with a mild learning disability and a tendency to be self-absorbed with an overdeveloped victim complex - always lashing out, blaming others, seeing conspiracy where there is none etc.
Harry is clearly a damaged man, with childhood trauma and issues which continue to plague his mental health.
As with my relative, he has grown up with a support network which has probably quietly managed and enabled his passage through life, but when big outbursts happen (as have happened in our family too) everyone backs off and 'grey rocks' him until he has calmed down. Some people just give up, too exhausted by the constant drama of it all.