Except no major party is calling for an end to these loopholes. So you are effectively advocating a raise in taxes that only apply to small businesses. As for the factory jobs, those people had no one but themselves to blame. Wanting skilled wages for unskilled labor led to automation of factories. If you want skilled wages, you need skills. Plenty of jobs for those, and with great wages.
I'd be ecstatic if we'd move forward with a flat tax of 23.5% and standard deductions of 60k for personal income, and no tax breaks for commercial and industry.
23.5%, I think that is the highest I have seen suggested.