I’m going to guess that there was more than one incident of the death of a college male due to head injury or drowning in that year.
And “hazing” is a legal term. There were certainly incidents of deaths due to alcohol poisoning and other dangerous activities spurred by peer pressure. We don’t hear about those.
I agree that I have seen no reliable numbers that make fraternities into places any more dangerous than college in general. It is entirely possible that there is a protective effect of fraternity membership. Brothers looking out for brothers could make life safer at college, I don’t think it is too far-fetched to think that, without better information proving otherwise.