I'm split on #2.
I love meat. I will not stop eating meat. Not only because I trust my personal "instincts" as tuned by millions of years of evolution to inform me to some degree what I need to consume to be effective far more than any conscious decision I might make, (e.g. that I think we're rather "young" in our understanding of how nutrition impacts the body), but because when confronted by that "animals have feelings and we are being cruel", my response is "yes, but that is nature."
Two qualifiers. Do I think we could be better? (more humane raising and slaughter) Abso-fucking-lutely. Do I think as technology grows, that we should move to more humane options? I would be more appalled if we didn't.
But will I ever "regret" choosing to eat meat, or fault those who do? Not a chance. I'm sure many people will disagree with the following, and I'd hope to hear a response rather than just get downvoted to oblivion, but so long as it is sustainable (which is a BIG qualifier that links heavily with my above statements about technological progress), we are at the top of the food chain, period. I am a predator, and I take pleasure in continuing to be one, to certain degrees.
Given that my justification is simply "this is a system that has worked for far longer than humanity has existed" mixed with "but I like it (so long as it does not become destructive to the point of disrupting said system that has existed successfully for so long)" I admit I feel that this is a weak argument. But I've both never found a really compelling counter, nor have I found any particular "holes" in mine. (Aside from the obvious "but it's not sustainable", to which I'd hand wave a bit and blame that more on an unfortunate side effect of market forces than on the choice to eat meat itself, which is also a bit of a reduction problem since the latter powers the former, and turtles all the way down, but I'd mostly respond with that I'd rather look for solutions than knee jerk responses, and personal consumption at this point is NOT going to impact "how things are", perhaps ignoring the wisdom of the whole "be the change you wish to see" etc... (but then, the change I want to see is simply better implementation, not vilification/removal of the "problem", so maybe not?)
Wow, this rambled. Sorry about that. This is just an issue that I have convoluted feelings on, as someone who tries to be conscious about both maintainable systems and loving to consume animals.