And then we'd be overrun by cattle, chicken, and pigs that would eat the crops that farmers are trying to grow to sustain the world. Once the grain is gone, then they would find their ways into our major cities, bringing about the chance for massive, widespread disease, which would increase the price of healthcare, which would in turn bite us all on the ass, because someone wanted to save a few animals. Do I agree that maybe we could cut down a little on meat, sure. Sometimes we go overboard. However to cut it out completely would eventually mean that we're going to someday become overrun by the animals we now consider food, and there's a potential that they may eat quite a bit of the grain, thus increasing the price of the remaining grains, which would then be stockpiled by the wealthy, and doled out by them for even more incredible prices. Also, if charities give a family a cow,, for example, that family can breed that cow with another cow, making more calfs, which would then increase the amount of food they would have, and then they could sell off their calfs or cows, making them richer in the end.
So you see, your logic is ridiculously flawed.