We Americans seem to have this idea that if someone is rich or famous we somehow gain the right to scrutinize every part of their life and invade their privacy.
I assume that Manziel wanted to play football because he loves football, not simply because he wanted to be famous for it. For us to put a 20 yr old under the microscope like this is utterly dehumanizing. It's easy to forget that famous people like Amanda Bynes and Lindsay Lohan are still actual humans, but our inhumane treatment of celebrities often leads them to have these sorts of psychological breakdowns.
If we don't "feel sorry" for people that live under this constant media surveillance, we're contributing to the problem that leads many celebrities to essentially go crazy.