In my opinion any form of money is the problem for all kinds in issues today we are facing. It could be either oil, gas, bitcoin, gold, paper money or property. If any one got more of these things than many evil minded people will be behind them to take the benefits. For example If you see how developed countries put pressure on oil rich countries to take the full benefits.
I agree with you here.
IMO greed is an inherent human flaw - it doesn't matter whether it's gold in this case or money or assets - humans naturally have a want for more and more "stuff" and will work and fight for it appropriately. Saying that gold is the cause of greed (and that greed is the root of all evil - which I'd argue is not the case) is wrong.