It really isn't, because even most breads are made using eggs and milk. Our entire food industry is based around meat, dairy, and eggs.
It's an incredible inconvenience to try to follow a vegan diet if you live in America.
But then to be honest, I don't really see an issue with killing an animal to eat it. In nature, it is kill, or be killed.
That doesn't mean the animal has no sanctity though. The conditions they make cows, pigs, and other animals live in these factories are abhorrent, and often unnecessary. And really, I don't think most people are aware of how bad it is.
So, bring on in vitro meat. Hell, it will probably taste more like the real thing than the **** you buy in the grocery store.