If moderation is the underlying principle in personal diet decisions, then I don't think eating meat is necessarily a problem.
That being said, the basic pre-cooking requirements of having to:
1. hunt, trap or raise an animal -> 2. slaughter it -> 3. dress, clean and butcher it
are almost completely removed from modern society, to the point where human consumption of other animals has been reduced to purchasing prepackaged, precut meat in glorified snack form, as a commodity. That's assuming you even bother to cook it yourself. The convenience promotes excess; and the excess breeds indifference towards the animal that was killed.
Meat is, for humans, some of the most nutrient-rich food available; in leaner periods of human history no one held any obfuscations regarding this as it was not necessarily easy to procure and was also first food to disappear in times of economic hardship. You waited to slaughter the lamb for Easter, or whatever.
That being said, unless you're a cage fighter or something you're not going to need exceptionally high amounts of animal protein to function. Sitting around eating red meat every day means may very well kill you in a few decades when the prostate cancer comes; on the other hand curbing gratuitous animal consumption makes you physically healthier, reduces the overall economic impetus to construct more human-shaped food-raising ecologies, and doesn't place you on some mental island where you can't fathom the situation of people who barely have even staple crops to eat. None of that means you have to suspend meat from the human diet, though.
Bring on the lab grown meat I say
I don't trust that lab grown meat stuff because A. it just assumes that we should maintain our current hyper-inflated levels of meat consumption and B. is the apex of transforming animal flesh into a commodity- boring, unnatural and divorced from life.
It's all first-world fine tuning in the end, I suppose. Herding societies like in central Asia who completely rely on animal protein and dairy are fine with me, though the diet may not be particularly the healthiest. Personally I have no problems with vegans or vegetarians either, unless it comes from too much of an anthrocentric place. Appetite cannot be dictated solely through intent- and that's my philosophical closer to these thoughts.