Youth soccer in America has rules against heading the ball. Under 11 can't do it at all, and there are time limits and incidence limits for kids older than that (though it probably needs to be outright banned for minors).
In addition to concussions, football players are also believed to receive repeated microtrauma from running into each other repeatedly, which contributes to CTE.
Football is a full contact sport. In games and in training, you are repeatedly slamming into people at full speed. There is nothing comparable in soccer or basketball outside of accidents (which by nature of being accidents happen much less frequently).
In addition to concussions, football players are also believed to receive repeated microtrauma from running into each other repeatedly, which contributes to CTE.
Football is a full contact sport. In games and in training, you are repeatedly slamming into people at full speed. There is nothing comparable in soccer or basketball outside of accidents (which by nature of being accidents happen much less frequently).