Paying more taxes is not ethical.
It can be. Whether it is an ethical action or not is situation dependent within the context of the society where it occurs.
Governments are necessary evils to maintain social contracts and civilization.
Agreed. One could say the same thing about corporations to a large degree. They are useful tools that allow individuals to collaborate for a greater good than they could achieve themselves.
Overreaching government is unethical.
Agreed with the caveat that your definition of overreach and my definition may be substantially different. The conservative US view of what constitutes overreach is not the only or even necessarily the correct one. And in reality you can get good results from two different governments with very different outlooks on how much government involvement is beneficial. You can have a very involved socialist oriented government or a much more constrained capitalist government and get good results both ways. Neither is inherently better or worse.
Government double-taxing is unethical.
Poppycock. Multiple forms of taxation are used on almost everything we do and for very good reasons. From a cash flow point of view there really is no such thing as double taxation. The tax laws might tax you more than once but at the end of the day you'll pay a certain net amount. Whether you pay $20 or $10 twice the result is the same either way. It is possible for the net tax rate to be too high but the whole "double tax on corporations" argument is a bogus one.
And...corporate income tax is a dumb idea in the first place, when those funds have already been taxes through both income and sales.
Corporate income tax exists so that non-active shareholders who bought shares through a secondary market don't have to pay taxes on their personal income taxes for activities they have effectively no control over. What good is buying a stock that goes up 5% if I pay all that back because Apple had a good year and made a big profit? Yes in a sense it can be "double" taxation but in reality it really isn't aside from the fact that money is paid on two occasions instead of one larger tax bill. And just because you pay (for example) a sales tax doesn't mean all other forms of taxation should be off the table. Good tax policy actually requires a variety of types of taxes to keep funding streams predictable. Depend too heavily on one tax stream (like housing values) and governments can find their budgets under water very quickly in the event of a downturn in that market.