To try and make a long story kind of short,
RE: Trenchard. Yes, at first he was reluctant. But when attrition meant he needed recruits, what better method than an ace hero at home to be an inspiration? The press and the public also contributed pressure to give England's flyers recognition, so it all came about from various sources. England was the last to publicize its aces, but they were the "stars" of their day.
RE: Mr. Ball. He came from a working class background and through ambition rose in status to a politician and middle class citizen. He had great hopes for his son, and did everything he could to create publicity opportunities. This in no way reflects on Albert's ability or anything else, it is just fact. Albert hated it. He was a true hero in the sense that he did what he did out of pure duty and love. And he was a very talented young man who inspired others in both England and America to join the RFC. But an ambitious parent often gains glory from their child. And there is no doubt that Mr. Ball sought and capitalized on this.
Now, I'd better shut up before I say too much
Cheers,
Scarlett