1) Your understanding of the world is way off base. Extractive industries benefit the countries they are in, although if the local government is bad enough that benefit may be concentrated almost totally in a small group.
Hmm... One of the jobs my old consulting company got was an emergency training session for a group of Mining Exces. The brief was that they had had an 'unfortunate incident' with some indiginous peoples, and needed some 'cultural sensitivity training'. When we did a little digging, it turned out this was code for being caught attempting genocide. Fortunately for the company, the tribe in question was almost unknown, so the company managed to avoid any serious trouble.