Re: I don't get it
But it's not 2.2% more income for everybody; not sustainably. Not even nation-states can create money from nothing.
In a few years, in order to prevent the deficit from exploding, they will have to raise taxes again or cut something or both. At that point, if you are in the groups which get hit by the tax hike and/or public spending cut, then the net consequence of this tax reform will likely put you in a far worse situation than before.
Or, of course, they could just let the deficit grow; this will push the problem on to the next generation and make it much worse.
Unless the tax cuts result in such a big GDP increase that they pay for themselves, but that's crystal-ball logic. You can believe it, or not, but I wouldn't bet the farm on it.