If you believe that instead of giving to charity or something that the best use of your money is taxes, why would it matter if there was an official change to the tax code or not?
Leadership would be paying extra taxes regardless of whether or not the taxes are raised across the board.
It feels kind of slimy to me to say "oh yes we should all pay extra taxes but I won't do so unless the government officially raises my tax rate" - uh so you mean you don't believe in paying more taxes unless the government forces you to? Like the rest of us?
It is definitely more along the lines of moral posturing to me. At least I know where someone stands when they don't want taxes to be raised.