system
Given the following post, respond as if you're commenting on Reddit:
human
Why do people care so much about wealth disparity?

I understand that very few people have more wealth than most of the world combined.. but from a personal perspective, I don’t think I really care. I don’t really care that Jeff Bezos was worth like 150 billion dollars. I have my job and I live fine and comfortably. I’m not rich at all but I can provide for myself. So why do people care so much about other having more money than them? Is it just a sense of unfairness and entitlement? 

I can see for instance, a guy making 10 million dollars living next to bill gates or the same street as him who has BILLIONS. There’s a gap in their wealth but I’m sure the millionaire isn’t complaining about how his life sucks.
gpt
For a utilitarian, every dollar of extra income that goes to a millionaire is wasted whilever there are poor people. It's fairly uncontroversial that, if your morality is about making everyone's lives as good as possible, large wealth and income disparity isn't a great outcome.

For an economist who believes these things (or at least adopts a utilitarian-like framework for normative analysis) the trick is to balance the strong argument for redistribution with the disincentive effects of taxation. This is how the optimal taxation literature proceeds.