So I'm going to number your points for reference.
I'm a bit pressed for time, so there might be some time before my next reply following this comment:
1. I don't care for the "circle of life" it's just an appeal to nature fallacy, it's fallacious reasoning (
Appeal to Nature)
2. Wearing leather is unnecessary for me, so I don't partake in purchasing of it because of the connection to animal suffering.
3. This is very important. Veganism as taken in the formal sense, aka the philosophical sense, pertains to the "UNNECESSARY harm of animals". If it is a necessity, then most philosophical vegans won't have problem, I can't answer for every vegan though. That's why I lumped so many of your points into 3, because they fall under the unnecessary part distinction, I don't know how to feed cats but if they can't live without meat, then it's a necessity and doesn't pertain to veganism. Regarding the survival thing, if it's necessary for you to survive as meat is your only available option, then it doesn't pertain to veganism. And this is definitely not a first world problem, I wouldn't even use that argument tbh, in fact the regions in which plant based eating is most prominent are countries that are underdeveloped (India, Brazil). And if we wanted to make the case for first world/third world, doing away with the animal agricultural industry and replacing it with plant based options both horizontally and vertically, we could easily start working to resolve famine and hunger issues while ending unnecessary animal harm in the process, a significant net good. There are studies on that if you care to look into it.
But if they don't have the "luxury" of plant based options, it doesn't pertain to veganism as it is a necessity for living.