You have a good emotionally supportive family, he doesn't, that is sad but unfortunately families can be like that. Sadly parents themselves can be very imature and they can also be very selfish and never really do have true "parenting" knowledge and skills. Often how the child interprets that however is unhealthy and they tend to feel "unworthy" somehow. It can be very hard to work in a family business when that is taking place.

He reached out for help to people that "again" let him down, again the answer is he needs to "suck up or man up".

I am sorry he is getting that when he clearly needs help. When I developed PTSD, I got all the "wrong" things said to me, it made me worse and the last thing I needed to feel is "guilty" for suffering from something that was not my fault. If your husband is depressed, he should get help. Seeing a therapist doesn't mean someone is "weak", it just means they need help. I have interacted with people that found therapy to be the best thing that ever happened to them.