This isn't necessarily true and making this argument gives people an easy way to refute the idea of raising taxes.

Kropotkin conveyed it best:

It is told of Rothschild that, seeing his fortune threatened by the Revolution of 1848, he hit upon the following stratagem: “I am quite willing to admit,” said he, “that my fortune has been accumulated at the expense of others, but if it were divided to-morrow among the millions of Europe, the share of each would only amount to five shillings. Very well, then, I undertake to render to each his five shillings if he asks me for it.”

Having given due publicity to his promise, our millionaire proceeded as usual to stroll quietly through the streets of Frankfort. Three or four passers-by asked for their five shillings, which he disbursed with a sardonic smile. His stratagem succeeded, and the family of the millionaire is still in possession of its wealth.

We need more systemic change. Granted, a tax policy could be permanent systemic change, but without corresponding political and economic change it's just as likely to be undone immediately.