i'm kinda superstitious lol. i think things happen in cycles. you could have a few years where in a whole ath. dept you have maybe 3 acl tears, and then you cycle through a few years where it seems like you're having that many in each sport that season.
i'll be the first to say that in the last 3 years i've not kept up on current trends/research as much as i should, just due to the schedule i've kept.
some acl tears are just a freak accident - w/out knowing JH's history anymore than I do i'd classify his in that manner. he was doing something he did everyday and this time just landed wrong for whatever reason and it happened --- i'd classify almost all non-contact acl tears this way
another thing is athletes are bigger/faster/stronger, and their muscles are more hypertrophic than they have ever been. ligaments size and tensile strength are pretty much predetermined and an overload on that ligament structure due to the amount of power that the muscles can produce can contribute in my opinion
i'd feel comfortable saying that yes females are at a higher risk. a number of things go into that. my personal, and slightly old fashioned, take is that biologically women's bodies weren't meant to handle the demands that competitive athletics put on the body. in middle/high school many times their isn't a base strength in place and in college athletics the demands are at the same level as on their male counterparts.
The Q-angle in women is greater than men, due to the fact that we have wider hips and this has been thought to cause some additional joint stress in women and many in research or who have been injured believe (including a few of my athletes/former athletes) that the female hormonal cycle can influence, possibly, the tensile strength of the ligament at certain points in the cycle
weak coreand especially hip strength is also a risk factor in both m/f acl tears.
i know it's not a lot to help, but my brain is kinda frazzled