It's not completely selfless. Pete has a method to his madness.
He deeply understands the psychology of the young athlete, especially the troubled young athlete. He knows there's volatility there, but he also knows if you show young athletes respect, love and structure they'll not only respect you back, but they'll run through a wall for you.
So not selfless, it's 100% serving a purpose for the greater good of Pete's football teams and culture.
Not all his actions back then had ulterior motives, he offered some of them suggestions/Alternatives to following in the steps of gangbangers in their Hood, he knew that there were dozens of them were not going to become football prospects, or even Athletes, he tried to help SOME hardcase kids to just not fall through the cracks.
For most those kids, Criminality is all they'd come to know, because they were surrounded by recruiters showing off their side of criminal ill-gotten-gains, Pete just showed them a way to have a successful life while being legit.
I'm really curious about how many of those young folk found their way out of the traps....I think of it like this, 'how many other kids never get to glean what goes on outside the Hood, without having an outsider taking the time to show SOME alternatives.
If I'm Pete Carroll, and I've gotten the opportunity to save a handful of young'uns, I'm feeling pretty good about that.
Are there risks? sure--but doing nothing doesn't really produce anything either.