By either
-exploiting the natural resources of this world for financial gain or
-exploiting the labor (human capital) of the world for financial gain or
-exploiting the consumers of the world by overcharging for products/services rendered.
-or some combination of these.
This wealth was denied to those who rightly deserved it by those who kept more for themselves.
This was either done directly by those who profited or via proxy, through investments or corporations which sheltered the individual from having to do the deed first hand.

It is right for this wealth to go back to the commons, where it was taken from in the first place.

Now, if you are talking about cash/physical property you saved throughout a lifetime of laboring and bootstrapping, then I have this to ask:

Do you not see that by your statements, you are supporting the very power structure that the oligarchs wish to maintain? Do you not see that they want you to fight for your right to hold onto your pittance after death? Because it supports their extreme hold over all of the world, even you and your future inheritors of pittance.