It's a movie. They HAD to create some kind of personal conflict, just as a writer has to do in a novel. The investigation team is the obvious choice for the anti-hero. The fact that there wasn't any such conflict in real life is moot.
(Except to the folks who were actually involved, that is. THEY might take a bit of understandable umbrage at the way they are depicted.)
As to Hanks always being the hero, can you imagine him any other way?
