You realize that the majority of ACL injuries are non-contact, right? You jump, and land on one leg, it can happen (see Jason White of Oklahoma a few years ago).
Full contact may be simpler, but statistics say that's not the likely answer. I'll stick with statistics over philosophy.
Look up the statistics on that type of injury happening during a football practice that is "non-contact" and get back to me.
The crux of my argument is the fact that no matter how the injury happens (be it due to a lineman falling on an RB the wrong way or a simple cut) the majority of these injuries happen during FULL SPEED FULL CONTACT practices. Nothing more nothing less.
The above post by SteveGarvey is the most lucid illustration of the idea in action (his first sentence anyways)
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