Again I ask, if the possession of morality dictates the hierarchy of the value of life, and it is fine to kill those lower on the hierarchy, why do we not kill babies or people who are severely disabled?
I never said a cow's life is more valuable than a mosquito's life. It's a lot easier to avoid running into a cow than it is to avoid running into a mosquito though, so unfortunately some mosquitos are the victim of our mere existence.
We don't dump all our garbage in the ocean because of our inability to prevent a single piece of garbage from entering the ocean, do we? Is it a hypocritical stance to take that we should do a better job of limiting and managing garbage in landfills because "**** it some garbage it still ending up in the ocean"?
It's not that individually making moral choices makes a person human, it's that it's our species is the only one that makes moral choices. Thus, we are distinct as a species. Babies and disabled people are just as human as everyone else. (And disabled people still make choices, by the way. And babies, unlike cows, will grow up to make choices.)
One of two things is true. Either human beings are moral beings or we are not. Let's examine what logically stems from that, and I think you'll find hypocrisy in your position no matter what.
A) Human beings are not moral beings.
-We cannot distinguish right from wrong.
-We are no different than animals.
-Thus, it's not wrong to kill animals.
B) Human beings are moral beings.
-Thus, we are distinct from other animals.
-Thus, it is incorrect to assert our worth as equal to every animal.
-You could then make the argument that it is not necessarily wrong for a higher species to take the life of a lower.
Finally, you have indeed been more vocal about cows and pigs than about insects. And considering that I kill a lot more insects than cows, it seems that you are misplaced in the behaviour you are trying to change. My eating habits don't actually kill that many animals. If you are really worried about reducing harm for animals (each of which have the same exact intrinsic worth) you should instead be sabotaging rail and roadways so that less insects get killed. You'll save more lives that way. Heck, you'll save more lives by sitting at home and not moving.
I get your point about limiting harm. Which is why focusing on meat-eaters seems strange to me. Because it means one of two things is true - either you actually do value cows/pigs/chickens more than other animals, or you are not engaging in the most effective means in limiting harm to all animals. You are caught in hypocrisy either way.