An easy to understand example is, I believe I should pay more in taxes and everyone as wealthy as I am should too.
I rent an apartment, but I rent it out at the cost it takes to maintain it in good condition, because I think profiting off rent is unethical. This means I'm generally renting much much cheaper than local rents, and my tenants can therefore build savings.
There can also be good business reasons to charge below market rent. Having a lower vacancy rate, for one.
Could I have charged $1000 and pocketed a little profit? Of course. But it would have come directly at her ability to succeed. I think that's deeply unethical. I think it's morally repugnant to profit from housing.
But the point is that I believe we should all chip in more to help each other out. If you make, eg, $750k a year like I do an increase in taxes isn't really going to hurt your ability to live comfortably. I'm confident I could travel anywhere in the world, buy a second home, etc. I could still do those things if I payed more in taxes. Just... Not as often.