And why do we give tax credits, subsidies and deductions to "Big Oil"?

"Big Oil" is literally the most profitable industry in the world. Why don't we stop this as soon as possible? In the first place, they are "most profitable" of any companies in the nation and world. Second, we need the tax revenues and third, if we really do use the "free market" Capitalist system, we shouldn't be giving them these anyway and finally, it could and would help wean us off this ugly fossil fuel that has us both polluting and, possibly worst, tied to the most unstable nations in the world. It all makes too much sense.