It is not my opinion that international corporations brutally exploit the third world, it's a fact. It is also not my opinion that Capitalism leads to this, the profit motive inevitably leads to it.
You claiming that developing nations should just fight against international corporations brutally exploiting them and absolving yourself of any responsibility you have for it is just sticking your head in the sand. If you aren't boycotting Nestlé, you're supporting them.
The "good" news is that there is no ethical consumption under Capitalism. You individually cannot do much, except protect, organize, and try your best to support less unethical companies whenever you can. However, to blame developing countries for corporations knowingly brutally exploiting them and offering no alternative is absolutely baffling.