So why can't eating plants be morally superior to eat animals.
Some moral arguments I can agree with:
A mostly plant based diet is less resource intensive. Since most wars are about scarcity of resources, eating less meat is voting against war in a tangible way. It is about promoting peace globally.
There are health benefits to eating less meat.
Meat is very water intensive. Water shortages are a big deal globally at the moment.
There are no doubt others. Just quick and dirty off the cuff thoughts.
https://arstechnica.com/science/2017/10/thousands-of-diy-foo...
"The question is not, Can they reason? nor, Can they talk? but, Can they suffer?"
I seriously don't personally like this line of reasoning. At. All.
So, I don't think so.
To each his own.
On the other hand, it's also true that war is often caused by greedy leadership.
I think there is a huge difference between the world before the green revolution and after, and I personally think that this difference is a big part of why we haven't seen major power wars after the middle of the 20th century.
World war two was the last major power war, and it was also the last major power war fought when there were not enough calories for everyone to eat their fill. Coincidence?
After world war two (well, after the 'green revolution' that happened in the mid 20th century) there was enough food, and... you could argue that we haven't had a direct major power war since then.
I personally think that the fact that getting enough calories is generally not a problem anymore has a lot to do with the fact that we haven't seen any major power wars lately.
Are there? To what extent?
I'd very much like to see the science to back up a blanket statement like that.
All the information in the world is but a google search away...
Our current animal feed system is terrible (grow large quantities of monocrop corn and soy on high quality arable land using vast quantities of fertilizer and terrible soil conservation practices).
But farm animals are an important part of the 'circuit' of a viable small farm. Chickens and ducks can help with weeding. Goats and sheep can turn sod into manure, one of them best fertilizers. Having meat/lard/soup bones in the freezer is an important way to get through the winter.
Legumes don't produce a complete protein that we can survive on by themselves. Vegetarian diets tend to skew too far in the direction of carbohydrates. Plants that produce fats and proteins in the quantities we needs (nuts, avocados, etc.) are pretty much as water hungry as animals.
A pure vegetarian diet may not in fact turn out to be more energy efficient or environmentally sound if it just replaces our monocrop animal feed farms with monocrops of unhealthy insuling-provoking carbohydrates.
Historically, highly hierarchical or slaveholding agricultural societies fed their slaves almost exclusively maize/rice/wheat -- and kept the meat/fish for elites. If you look at the archaeological record and remains of those bodies, the health effects are obvious. Short stature, dental health issues, bone density problems, shortened lifespans. Roman soldiers were terrified of their taller and stockier Germanic/Celtic foes who lived on a more well-rounded diet with more meat and dairy.