Soldiers are no better and no worse than any other group of young men. The military does a lousy job training line troops on weapons safety, and a fantastic job of training that you are an invincible killing machine. Young impressionable men, who are already prone to thinking they are invincible, act as such. NDs aren't rare and can happen to anyone, so always be aware of what you are muzzling. That's whats important to remember.
I find the remark on soldier safety to be implausible and not supported by the evidence.