You know...
...that's a really good question. I know that eating live things is not the way to go if the human race is to evolve past their present stage. Empathy is what humanity lacks; when it has enough of it to realize that killing living creatures for sustenance, a practice long since necessary, then I feel that it will finally be on its way to the next level of advancement. Despite the "awareness" I have regarding this shortcoming on my part (I'm also well aware of the fact that my sports fanaticism flies in the face of the fact that I understand that any mechanism society has invented to segrate its members into different, rival groups must be eliminated before we can evolve further), I must say that I much prefer the fruits of the ocean to those of the land. It's a conscientious decision based on a dichotomy that is impossible to reconcile so I just chalk it up to being a hypocrit on some level.
I like beef and chicken but given the choice, I prefer salmon steak to rib-eye any day of the week and twice on sundays. Owning an aquarium has done nothing to mitigate those desires. The way I see it, if I can stick to eating those fish that I'm fairly certain are available aplenty (farm-raised salmon, any kinds of sardines, tuna other than blue-fin), then I'm OK. I also enjoy shell-fish a great bunch and thankfully, except for the lobster, all the other shell-fish I like are available in spades.