You mean Michael Phelps who has multiple DUIs and smokes weed? Kobe Bryant who settled out of court after being accused of sexual assault (and admitted at least to cheating on his wife and strangling the partner because that's his "thing")?
I'm not saying I think it's fair to do so, but it would be way too easy for an interviewer to give an uninformed applicant a hard time if they just pick someone they've heard in the news. I'm in the same situation as
@calivianya - yes I can name some sports people and maybe what sport they play, but I know literally nothing else about them. But with the exception of really significant things like OJ, Michael Vick, and Aaron whoever the baseball player is that just died, I would have no clue if I was choosing someone who had a history of violent crime or horrible racism/sexism/whatever. And any attempt on my part to pick someone and give a reason I admire them would be complete BS, which I don't love doing in an important interview. So for me at least, I'd probably say "I really don't know enough about any athletes to meaningfully comment on what I admire about them, but generally I admire people who X, Y, Z."