* Raising corporate taxes won't work, because they'll just pass it along to (poor) customers.
* Lowering corporate taxes will increase revenues, because corporations will stop offshoring their income. (Let's ignore for the moment why they'll stop offshoring revenue. We'll just wave our hands, say "more costly to hide the money", and assume it's true.)
* Raising taxes on the richest 2-3% won't bring in as much as recovering more from corporations bringing their income back onshore, so we shouldn't bother. (And we'll continue ignoring the fact that there's no evidence lowering corporate taxes actually would bring any of that income back, so that we can keep putting off raising income taxes.)
Those are all tactical arguments why raising taxes won't bring in any more tax money from corporations, or from the richest 2-3% of the population. (Lots of overlap there, by the way.) But they all assume the goal is, in fact, to obtain more tax revenue from those people and corporations.
Then you claim that supporters of raising taxes don't care about increasing tax revenues, but merely "beating down the rich". I don't know if that's just a rhetorical tactic, but assuming it's not, I'll try to explain: We don't believe you. We think you are wrong. Lowering corporate taxes won't bring in more tax revenue. The wealthiest 2-3% of the population are rich, and they are not overtaxed.
There is historical evidence that higher tax rates in the top brackets were good for the economy overall. Those of us who support raising the top tax rates and corporate tax rates know that the entire economy would benefit.