5. It will reduce the amount of money available for badly-needed public investments.
4. It will drive up interest rates and the cost of health insurance on the individual market.
3. It weaponizes the tax code in a manner that is unprecedented and invites retaliation in kind, thereby worsening the blue/red divide.
2. It exacerbates inequality.
And, the #1 reason is . . .
1. Its impact on growth will be negligible, based on recent experience (Bush tax cuts; Kansas), logic (existing corporate cash mountains; low interest rates), and informal surveys of CEOs (the Cohn tape, among others).