How thorough of a background check do you do on someone before going to the range with them? I'm a vet who's dealt with ptsd, would you not goto the range with me?
Not without at least finding out a bit about you. Had I not known you through this forum, absolutely not. Seems like if you recently had incidents like this kid did, it wouldn't take long to find out about...
When I meet vets, I don't hand em my handgun, do I?
Being a vet doesn't automatically make me trust you. And again, this dude spent time in jail on a DUI, had the aforementioned "kill my family" incident... even the most cursory of inquiries about who this guy was would have revealed that.
And again, given Kyle's mission, I maintain that he probably knew. And if he didn't, having knowledge of PTSD and what it can do/how it can manifest, if he didn't do any kind of cursory inquiry into the dude, then that was a big, big bad decision.