Beyond this, managers and policy makers listen when Buffett talks/writes; an outcome of his 50-year track record in investing and managing at Berkshire. I personally don't think there's anything sinister going on.
You can get a really good overview of Berkshire as a company, including its operating companies, investment philosophy, and current investment holdings from the annual letters that Buffett writes: http://berkshirehathaway.com/letters/letters.html
If you want to see exactly what securities Berkshire owns, you can look up the 13F filings on http://edgar.sec.gov
To make money with no regards to anything else? Yes, they are dangerous to the human race and should be treated as the absolute worst terrorists possible.
However, if their end goal is to actually leave the world a better place than when it was when they were born, and it just happens it takes being one of the richest people ever to do that? More power to them, and I hope they succeed.
Not all rich and powerful people are assholes, some just want to make the world less shitty, and some actually succeed at it.
I arrived at this line of though when I started wondering why would the head decision makers of (for example) trafigura decide to horribly pollute the Ivory coast just so they can squeeze out a bit of extra profit, when they are all already super-rich. You can only enjoy so many yachts and so on. I arrived at the conclusion that their motivation is not to get more money per se, its to beat the other guys.
Not sure how true this is. There are other options, including the using the Canadian Pacific Railway, which also operates in that corridor.
http://www.fool.ca/2015/09/04/will-a-keystone-rejection-bene...