This has always been a shit argument. Injustice has to be fixed across the board, otherwise it's a tax on just the honest/moral people.
If he said that the would not mind paying more for taxes, that is ok.
Saying "it is not fair" is just populist BS - would you keep money that you honestly thought was given unfairly to you?
Think: a sincere declaration of a willingness to cooperatively sacrifice to solve a group problem, if others do too.
Don't think: an offer to individually self-immolate, which would not solve the problem. That is a straw man test of whether someone "means" business.