Didn't he do a lot more than that? According to her letter, he groomed her and then assaulted her seriously several times.
For me, any man who has ever used his greater strength, power or wealth to have sexual contact of any kind, with any woman, of whatever age, against her wishes, deserves everything he gets.
If the girl is underage, it doesn't matter that she was willing - it is the responsibility of the adult to observe the law.
Everybody who makes excuses for these predatory men is complicit in the harm done to the victims.