I'm anti-vegetarian because animals taste good.
Though not killing animals on account of them being intelligent makes me wonder where the cut-off is. O_o
IMO, the only time we should lay off eating an animal is when we know it is endangered. Because we stupid humans are supposed to have a concept of future and how killing all the fish today means there's none for tomorrow.
According to me, the cuttlefish and the octopus are the more admirable creatures that end up on my dinner plate. Well, pigs are smart, but pigs don't fill me with awe... or look like Chtulhu.
Though considering that Kaxen's dictatorship has soylent green
... I don't think the intelligence factor really helps.