Having read this thread completely now I can say two things:
A. The looks like it was cleaned up a bit because I see a few missing posts
B. The op is extremely ignorant. I mean if your fish is very sick, injured badly, or dying I could see the validity in "destroying" it. But to kill a perfectly healthy fish because it is or possibly is a hybrid, that is extremely stupid.
I can agree that buying a Midas or Red Devil and getting a mix of both sucks but it doesn't warrant the genocide of hybrids. If you truly want a pure fish you have to be willing to buy from the right sources.