Earlier quoted context omitted.
Yes, they are. If they weren't you wouldn't care if someone made more than $15M.
Is watching those around you starve/freeze to death due to having $0 (or less!) not a reason to care about whether some people make more than $15M? How many people could that hoarded wealth have housed and clothed and fed?
The problem is that by looting rich people you will not end up with the problem.
In fact, you can make the problem much bigger mid-term by killing incentives and making people into poverty...
Cuba or Venezuela were richer than Spain in the 50s just to give you a couple of examples. And Venezuela has natural resources.
What happened? Well, yes, this kind of: let's take everything from the others and give to the poor.