Jon, why feel guilty?
If all your fish went back fine, as 1mine did, then you did nothing wrong.
What are we going to have soon? The temperature police? It may have already started.
Look how many people say they will fish for something else. Are those fish not subject to the same lowered D.O levels and high water temperatures? And fishing lakes is even worse.
But it's ok because it isn't barbel.
I only fish the Wye these days, and any regular Wye angler can tell you the nature of that river. It isn't the Thames, Kennet, B.A etc.
If these people love the barbel so much, why are they trying their best to stick a hunk of metal in their lips?
Fish away and keep fishing, but do the utmost to look after the fish. Wear waders so you can rest them in the flow, do you really need that 898th photo? Get the weighing equipment sorted beforehand, use barbless hooks so you can unhook smaller ones in the net while resting, use sensible gear - 8lb line and 20 minute battles have no place in barbel fishing.
Unfortunately, the " I'm offended " element of society has migrated to fishing.
Well, I'm going to the Wye on Thursday evening. If anyone is offended by this, post your frustration that I refuse to adhere to your statutes. I've only been fishing it for 25 years..