Do you know the level of Tax evasion corporations commit everywhere (or are they fighting for freedom)?
If, by "tax evasion," you mean tax mitigation, then I do not see what the problem is. Everyone is entitled to arrange his affairs so that his taxes are as low as possible. If, by "tax evasion," you mean the crime of tax evasion, then I have not seen enough evidence to endorse your conclusion. Certainly, one does not regularly hear of corporations being prosecuted for tax evasion.
I do not presume to evaluate the harms or benefits of any particular company; , in the absence of anything even approaching perfect information, I cannot possibly do so. But I am quite sure that the free market system as a whole is preferable to any alternative of which I am aware.
I will suppose, for the sake of argument, that oil and other companies lobbied for the war. Isn't it very telling that the government is so willing to subordinate the public interest to the interests of a narrow class? The war in Iraq is just one example; protectionist policies, farm subsidies, and "corporate welfare" are others.
Speaking of corporate welfare, I would note that I am not a fan of corporations or businesses as such. I also strongly support the existence and the activites of labor unions, and would oppose state interference with strikes.
I have no pressing objections to antitrust laws, or to the existence of public transport. These rather minor violations of liberty have, at the very least, plausible public policy justifications. But, strictly speaking, they are violations of liberty nevertheless.