There's a couple of problems here. No government truly has clean hands, though some are obviously much worse than others. And there are a number of governments that will ranked differently depending on who you talk to: a government might be considered abusive by one group but doing what it needs to survive by another.

But it gets more sticky. Under US law (crazy as it sounds), it is illegal for US businesses to 'boycott' countries unless those are on State department's list. So while you may not want to deal with some countries, your business (and possibly you) may be subject to prosecution. Of course you can always just 'not bother to pursue' certain markets, but if Uncle Sam decides you have other motivations, you can still be in trouble.