For starters...I would not buy a fish that would outgrown my tank so I would never be in this situation. Personally...I think there should be laws against selling fish like RTC and arapaima. By not buying them I am not supporting thier continued sail. When I buy a fish or any animal I am taking that animal's life into my hands, it is my responsability to provide it with a decent home for its life span, I would never think of getting a fish that would outgrow my tank. Red devils are called devils for a reason, remember that when you buy them. What else would you expect from a large aggresive cichlid? I would not buy one and say "Wow...what a mean fish, I should eat it" when I already knew what I was getting in to.
Don't feel bad about hurting my feelings because trust me, my feelings are not hurt. Just because I don't agree with what you did does not mean I am sitting here crying "That guy ate his devils".
It is great to be on top of the food chain but keep this in mind. If ever you have a relative get killed by a wild animal don't seek out vengence on it like most people do...its just the food chain. Humans like to preach how great our statis is until we are truely put in our place by a crocodile, tiger, bear or shark. Then we get all upset and go on mass killing spree. If we truely are comfortable with our place on the food chain then another human being eaten would not be a big deal.
Just for clarification. I have no problem with meat eating or people who eat meat. I have a problem with factory farms and other cruel institutions like them. Thats why I can watch a cow die and not shed a tear but am still vegetarian.