A few people paying $x million more per year in taxes is insignificant but tens of thousands of people paying $x million more per year in taxes is significant. For example I advocate for raising taxes in my locality to better fund the schools. It’s bad policy to say, “Well why don’t you just voluntarily pay more?”

Whether or not you still think people should just volunteer to pay more if they think taxes are too low you have not addressed the essence of the situation. Namely, “Are taxes too low and should they be raised?” Why or why not?

The idea is "I want all those rich like me to pay more" not "I want to pay more".

"Come and take it! Please, take it! I wish you would take it" .. but if you don't, I'll keep it