It is also up to the employer to decide whether or not a person with something like this in his past will be able to live up to the standards set forth and be sure those parameters, as well as repercussions, are articulated up front. Having never met the young man, I am not sure we are in the position to make such a call.
It's not like he's going to be a teacher or a doctor for a living, he is doing something where his job is to run fast and smash into people.