I'm relieved to see you use "correct taxes", opening the way for a more nuanced discussion and getting us away from, "no, taxes are necessary! No, taxes are evil!"
Keynes did advocate tax cuts, generally during a (we're talking balance sheet here) recession, basically for labor, where most of the demand resides. (He also supported increased government spending, during a recession, to temporarily counteract the deficit of demand in the private sector, so in that sense he was obviously comfortable with temporary deficits.)
But the tax cuts he advocated came after a period of relatively higher taxation, which was during the economy's expansion phase. Logically, you would expect him to "be fair" and advocate for a reduction of government spending during expansions, and in fact he did. The expansion phase was supposed to be a time of government surplus, government saving "for a rainy day".
Yes, I know government did not build up a savings during the last expansion. I think we both know why.
