Trying my best to do so!
It isn’t a claim or an opinion - It is statistics. And of course not every frat or every member of a frat is involved in SA and I am not saying your son specifically is. I have close friends who participated in Greek life and I don’t think they were all rapists.
But to pretend that it isn’t a very serious problem specific to Greek life is putting your head in the sand. Please read the link I posted above.
Here are others: