Corporate tax is wrongheaded because they go against the cardinal rule of taxation which is that whatever one puts a levy on, one will inevitably get less of... as such taxes on corporations means less investing, less hiring, fewer jobs and a smaller economy, which hurts the rich, the poor and the middle class alike.
Corporate tax is wrongheaded because corporations, one might say, do not pay taxes... rather, they collect them, passing the burden to consumers as a cost of production.
Corporate tax is ineffective because they result in a feast of rent-seeking a cornucopia of credits, exemptions and other subsidies conferred by the political class on favored, and grateful, corporations.