I can't imagine losing my brother. And his poor wife and kids... I lost my father at an early age. So sad for you and the family.
As a Licensed Professional Counselor who works primarily with men who are new to therapy, I want to retirate your point that there are people out there who care, who can help, and that therapy is nothing to fear. I hear that from my clients a lot, which they said was surprising to them.
Suicide can seem like the most unselfish and "right" thing to do to those in the thick of it. It's an illusion that can be hard to see through so I agree - we need to get inside with our people. Even then, the choice is theirs. I had a friend kill himself even though he was surrounded by support. Can only do what we can. Living with guilt bc we wish we'd done more serves no good except to push us to be real with everyone, always.
I wish you well, however that may look for you.