He is "alleged" to have had sex with a minor. Virginia Roberts, one accuser, said she had sex with Andrew in London. She was an consenting adult by law and she never stated it was Andrew that "forced" her. Her "keepers" did. Until there is evidence that proves Andrew had sex with a minor that'll stand up in a court of law, he's actually not committed a crime. I believe Andrews accusations have been looked into twice. Once by the Florida courts and deemed inadmissible and thrown out and by the Metropolitan Police System that deem the allegations weren't able to be prosecuted. What happens with civil suits is a totally different elephant in the room and it remains to be seen if any are filed against Andrew and he actually is prosecuted. Allegations and accusations do not a criminal sentence make nor award "justice". And, as in all court cases, the burden of proof is not on Andrew but on his accusers.
Andrew, whether or not he knew the full extent of Epstein's sex ring or not is not a crime. Sure, he could have said "hey... this is wrong. Gotta tell someone" or not. That was a decision he made at the time. It doesn't mean Andrew is complicit in sex trafficking of underage girls. That is all on Epstein and perhaps Maxwell (whom they're investigating) and some others that haven't been named as of yet. Who had sex with Andrew isn't being investigated at this time as far as I know. They're investigating the sex trafficking ring itself and its big players. Those are the ones that, in all honesty, the victims need to have brought to justice. Andrew, in my eyes, is small potatoes compared to some of the "big" players.
I'm going out on a limb here and even suggest that Andrew's legal team have advised him to lay low, don't talk and follow their advice. Andrew has not been exonerated from any wrong doings by any means but until that time comes, which I fear will never really happen, he's only shown very poor judgment in his friends, his reputation now has the "sleazy" tinge to it and the public's opinion of him has plummeted to a new low.
The past can and does come back to haunt you and this is a prime example of it. Even if Andrew had sex 10,000 times with women in Epstein's circle that actually were of legal age, its the company he kept and the perversion of that circle in its "dark" underside that is hanging over Andrew's head right now along with many, many more powerful and influential and wealthier men than Andrew.