Another way to frame this: if I'm a millionaire and want all millionaires to pay more tax (including me), paying more tax without trying to get others to do so

Another way to frame this: if I'm a millionaire and want all millionaires to pay more tax (including me), paying more tax without trying to get others to do so could allow other millionaires to spend their tax savings to lobby against higher taxes. I may not want to sacrifice myself nor do I want to pay more tax for myself, but simply want a fairer system. A society is more than the sum of individuals, obviously.