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To answer your first and second question, I don't think the attention, so to speak, will bounce from one from one league to the next; nor do I think that there should be any additional "digging" or attempt to search for something that could or could not be taking place. Beyond the court, the field or the ice rink, these athletes are also individuals who have personal and private lives. We, as fans, spectators and critics are not entitled to what happens behind closed doors. Obviously, anyone who abuses another, whether physical, verbal or mental, is wrong and should have to deal with the consequences and repercussions.
To address your third point, honestly and personally, I don't think it's fair to even make that assumption. Unfortunately, there are situations that resonate with what you are alluding to, but the fact that an individual plays football doesn't give me the right to automatically think that he would be involved or engaged in some violent act. There is nothing that would specifically or vividly define this particular predicament. For me, the only thing that these events clarify is that people, in general, make mistakes. I think sometimes it's harder for us, as a whole, to accept the faults and mistakes of athletes/celebrities due to the fact we place them on such a high pedestal. Of course, we would like to believe that nothing of this caliber ever happens, but the truth is that it does, and the fact that they are who they are, shouldn't give us more room to assume the worst and scrutinize harder.