The US medical system isn't completely without compassion. It does have it's problems, but it's not completely bad.
We don't know or I haven't seen any reports on how severe the injury was/is to Fowler's head. I've seen where some one has attempted suicide by shooting themself and totally blotching the job and living. It's been three weeks since the shooting. That is plenty of time to recover from a gun shoot to the head.
And who knows, maybe he left against doctors orders. People do that all the time. And considering who this is, I could almost bet that the CofS had a Scn doctor go and sign this guy out and is now hiding Fowler.
The news has reported over and over there are no other suspects except for Fowler (OT whatever). That is a HUGE flap for the CofS and you know they are going to cover their ass before they care about Fowler's health. And of course the CofS knows more about taking care of a person with a gun shot injury to the head. Read this next with complete sarcasm: hell, just have the guy do an assist by repeating the actions with a gun (hopefully it won't be loaded). That'll fix Fowler up faster than the doctors every could.
Yes, he should have been under police watch. But you forget, the police in Denver don't know what the CofS is capable of.