So I do have some basic knowledge of how it works. Thanks for again trying to devolve the discussion into a personal attack instead of giving me any evidence whatsoever. Blood flow restriction is one of many cutting edge techniques that are very effective in rehabilitation and basic training.
Again, this is one of many techniques employed by the current strength and conditioning community. The basic point in all of this is you seem to be arguing the current training regimen is not effective at preventing injury. While true at lower levels of sport including high school, the prevention of injury is more important at higher levels of sport including college and professional (due to financial issues) so the movement patterns and muscle imbalances are more closely scrutinized to prevent injury. But, again, please regale us with your knowledge on the topic.
A few articles you may want to look into for your one argument you seem adamant in maintaining:
http://www.ncbi.nlm.nih.gov/m/pubmed/26504274/?i=16&from=blood%20flow%20restriction%20therapy
http://www.ncbi.nlm.nih.gov/m/pubmed/25770798/?i=45&from=blood%20flow%20restriction%20therapy
http://www.ncbi.nlm.nih.gov/m/pubmed/25678204/?i=52&from=blood%20flow%20restriction%20therapy
http://www.ncbi.nlm.nih.gov/m/pubmed/25430600/?i=59&from=blood%20flow%20restriction%20therapy
I have more if you are interested in expanding your own knowledge. The main issue is cardiac related actually but you thoroughly check your patients/athletes before going down this road. The ligament argument can be made with any exercise leading to hypertrophy. The body is attenuated to a certain base muscle mass and increasing that in any capacity will stress the supporting tissues. So if your argument is that athletes are gaining muscle mass too quickly then that is another debate.