Up until recently, like a week or two ago, they were limited to donating what, around $100k per year to politicians? That is pocket change to guys like that.
The Koch guys have repeatedly tried to end government subsidies for ethanol, for instance. They are involved in the industry and take those subsides, but if they didn't their employees would lose their jobs as their competition would have a decided market advantage for taking the subsidy.
You do understand the reality of economics, that if someone can bring something to market for cheaper, they can sell it for cheaper and make a profit where you realize a loss?
They aren't the devils you think they are. I think you legitimately believe this, but you have been mislead by hufpost types who have an agenda.
I was ignorant of the Koch guys until a few months ago. I started looking into them. At first I found all the evil stuff you seem to relish. But if you dug deeper and went to unbiased sources, followed the money, you'd see they are decent guys, you might disagree with about many things, but would probably agree with more than you think.
They are very socially liberal, fiscally conservative. Always have been.