There is a lot of talk about youth baseball arm injuries, and a lot of finger pointing. This is the actual research and content from thoughtful people on the subject.
Basic conclusion -- common sense with pitch count limits and rest requirements help reduce the chance of arm injuries. But, basketball players tear knee ligaments, football players get concussions, hunters get frostbite .. and pitchers get arm injuries.
The only way to prevent risk is to not do something with passion.