What if people are manipulated by bot farms and think tanks and talking points supported by those corporations?

I think this view of humans - that they look at all the available information and then make calm decisions in their own interests - is simply wrong. We are manipulated all the damn time. I struggle to go to the supermarket without buying excess sugar. The biggest corporations in the world grew fat off showing us products to impulse buy before our more rational brain functions could stop us. We are not a little pilot in a meat vessel.

Corporations would prefer lower corporate tax.

US corporate tax rates are actually every high. Partly due to the US having almost no consumption tax. EU members have VAT etc.