Re: Why kill them???
My favorite is watching people drag stringer-chains of dead/dying salmon reminiscent of the crypt keeper to their vehicles, then give me the "oh, but they're going in the smoker!" routine. Oh right, the new as-seen-on-tv smoker that removes the heavy metals and other contaminants! Of course! I always forget about that fictitious device! Catch and release for me, thanks.
Working out a way to convince my university to allow me to hold my TA office hours on the nearby creek...