Ah yeah I'm only really messing lol fishes aren't people I'm sure Abraham meant people. I keep fish in glass boxes and to be fair to me they don't seem to mind, if I thought a fish was stressed I would do my best to remove it for sure.And the rest that goes with that.
So in reality, we all are denying freedom to things. Yet we are also keeping them fed, predators away from them, etc.
I get where you are going and I hope you see where I am going. While out fish do not fit what Lincolns statement was meant to address. Then this whole hobby with any hobby that involves critters is wrong. No matter if we make their life the best it can be from our point of view.
You have a tank, or at least your avatar is a tank. So it puts you at fault also. This is not the direction I am looking for this to go. Take out the glass box and then lets move to the critters as to what is or is not ethical.
We all know that the arguments can be made for fish have it better in a glass box most of the time or that we are cruel for not letting them be part of the food chain.
Lets get down to the specifics. Like is killing an undesirable creature ethical or not.
But in all seriousness ethical is one thing but it comes down to someones own morality really, personally depending on what it is I think it's best to try and rehome but if that's not possible and killing is required then humanely is best. But to me that's just common sense.
Like I don't know if itl feel pain or what but it's probably best just to assume it does and do it humanely not just for the animal but for me aswell I don't want no bad karma lol