I don't normally kill any trout. I also think that if someone wants to eat one every now then they should be able too, provided they have a fishing license and they follow the slot-limit regulations.
I also was wondering why the only place trout adequately reproduce is in the South Holston? I am also wondering why the TVA and TWRA don't establish minimum flow rates on the tailwaters. It seems to have worked on places like the Frying Pan, South Platte and the San Juan, just to name a few. My guess is that answer is money.