It's simple. We need a more progressive tax system and we need to find ways to actually capture the taxes owed by the very wealthy. Changing the proportion of charitable donations which are protected from tax? Deemed disposition of stock options paid in compensation either at the time the employee receives the options or at the time she exercises them? Surtaxes on residential property worth rely mostly on  middle class taxes because that was where all the money was. That is less and less the case and policy should take the change into account.