That's a valid point. I'll say this - when I have kids, I'll probably try to gear them toward lower risk sports like baseball. Of course, kids can hit their noggins in a variety of situations but with contact sports you're just asking for it.
To bbb's point, I'm no C.T.E expert but I'd bet my bottom dollar that the average soccer player's life is a solid 15 years longer than the average football player's.
EDIT: And I hope it goes without saying that I'd never advocate to BAN any sports. People make their own decisions, after all. But I'm debating whether or not to offer my tacit support as a fan.