As for taxes, there obviously isn't like a fair tax rate table written on a stone tablet somewhere in the clouds. Optimal tax rates depend on a billion things. If the rich/poor gap gets wider, you want more progressive taxes. If it gets narrower, you want flatter taxes. If you are running a big deficit, you need higher taxes. If you are running a surplus you want lower taxes. If you need investment worse than you need business revenues, you make taxes flatter. If you need business revenues more badly than you need investment capital, you make taxes more progressive. Etc. This is policy making, not religious doctrine.