Re: Why kill them???
Honestly there are a few rare occasions that fish should be killed. The Striped Bass have been over taking prime waters such as Diamond Valley Lake and Castaic Lake. Just like the Asian Carp is spreading north to the Great Lakes. Some fish should be slaughtered in order to make room for NATIVE species.
That doesn't mean you should consume them either. They make great fertilizer for lawns and other ornamental plants.
Personally I have greatly reduced my consumption of caught fish by over 95%. The pollution is so rampant, not to mention shrinking populations of wild fish. No matter how good something tastes I don't think anyone should eat anything into extinction. Our Pacific Salmon still have not recovered from the droughts. I just refuse to further reduce the population.