Now that the tax breaks for the uber-wealthy are going to expire, we get to hear all the vitriol again from Fox Noose and its brother-in-arms. But beyond the hate speech (more blatant victim-blaming) is the basic economic argument given by pretty much every conservative*:
The rich create jobs for the poor and middle class. If we alienate the wealthy and/or tax them too heavy, we will lose out on their ability to produce jobs.
The poor and middle class sacrifice to create wealth for the rich. If you alienate them (which is the de facto mode in the world and the US), you lose your ability to gather your wealth. And, you may face a terrible, terrible revolution.