Well said Split Cane

I don't think there is a lot to be concerned with unless they are taking more than their share of what the law allows.

I'd wager the summer temps kill at least as many as fisherman. Trout cannot survive long in water above 70 degrees as they can't feed. If it hits 80 then it's definitely lethal. Broken Bow averages 77-78 through July and August. If you get two to 3 weeks in the 80's (happens ever few year)those not sitting in discharge will starve or asphyxiate. As you could imagine the Guadalupe section below Canyon is the same story, just hotter. The daming of these rivers in the 60's created aquatic desserts in the tail races as the year round cold water drives most of the natural species and their prey downstream. If it weren't for the stocked trout there would be little to fish for unless they started stocking Striper or other similarly cold tolerant fish. The decision to year after year stock literally tons of trout in these tail races has far more to do with business than biology. They are put there to sell fishing licenses and support the local economy. They are there for the license holders to catch and if desired, harvest for the table. (within the limits of the law of course).
I'd be very curious to see creel surveys to compare the number of licenses sold to those keeping fish vs. those practicing C&R, but from what I've seen there it's well over 3 to 1 on the bank.

There are plenty of trout streams that need your help in asking for additional protection and regulation from over exploitation, pollution, etc. However, I think you will be hard pressed to find a biologist who would put LMF or the Guadalupe anywhere on that list. I'd wager many would argue the dams should never have built in the first place. That all being said, enjoy them for what they are, keep on educating your fellow anglers about the laws and if you see one being broken report it!