Yes this is true but a lot of places can't mantain a sheep herd, because it is too cold or to dry for grasses and food for the sheep

True...and you don't need to live in a house, or use the Internet, or have a bank account, or have a computer/mobile...all things that have caused catastrophic damage to the environment and killed countless animals.

One has to draw a line somewhere- perhaps you shouldn't be holier than though just because you draw the line at "I don't want to see the evidence of the death"

Maybe YOU don't have to eat animals to survive. What a privilege u you have that you live in a place where vegetation can be grown in your area or more likely shipped there cheaply(not free of harm to the environment or people\animals). But your experience is not universal there are places on earth that people live where that is not an option. And some of those people have been living there sustainably for 10s of thousands of years. Not to speak of people who's body needs meat to live because of some other reason. You can not eat animals and that's fine but it doesn't replace the science of how to stop environmental damage.

I dare you to travel to Uzbekistan and see for yourself what's needed to grow cotton for the whole region.

Why is this always brought up, stop spreading this. Animals usually are not fed grain unless it's harvesting time. We also do not grow food just to feed them. The grain we feed animals is shit you cannot eat. It's roots/stalks/stems/bad/rotted plant matter. It's the leftovers from the greens we can consume. Most animals also are raised on land that is not suitable for crops, rocky/hilly/weak topsoil land.

We've been doing it for about as long as we've been humans.

We have been doing a looot of things for a long time. Procreation without consent for example used to be a big staple in our development and yet we have ceased to find that acceptable, fortunately. Weather or not we have done something for a long time has no bearing on it beeing a good thing or not.