this issue comes up time to time and you would get different answers depending if a carp-hater or a carp-lover answer your question ... i for one is a carp angler ... won't try to stir pot here to argue whether carp is bad for the ecosystem and whatnot
IMHO, to be fair ... if you do hate carp so much that you have to kill every catch ... bring them home, and bury them in your backyard, keep the shoreline/banks clean ... each and everyone of us has our right to do whatever we want with our catch (given that it's not oos and within your limit), just not dumping it on the shore ... if you don't care, why not just dump it back and let them live? it is a living being after all.
just my 2 cents