One thing to realize - it is paper money, stocks, obligation, not actual resources that rich people own. If you actually spend billions on yourself, like building multiple palaces, huge and multiple yachts, then yes, you are consuming resources egoistically for yourself. If the money are "working", producing something that not for you to consume (also known as "invested"), and especially if you donate a lot for charities, then sure, you can be a good person.