That's true. But at least now western companies get scrutinized a lot more and are less able to get away with shit. The Chinese companies don't have anyone at home who give a shit about where they get the ore and what they do to get it. And they try to avoid any western reporting often with the help from the politicians there. So western media haven't been been reporting what the Chinese do or haven't been able to. I have talked to people who have or currently work in mining in Africa and anyone could ask them about things like Chinese refining operations using crap loads of mercury and just pumping it out into rivers or hidden tailing ponds hastily built. I just talked to a guy over coffee last Sunday, who flies into Guinea periodically on mining related business (mind you he's taking a pass until the Ebola outbreak is taken care of).
FWIW, I don't fret about what my ancestors did. I can't help that and don't subscribe to the idea that I have to pay for their sins or indiscretions other than to have to live with the world they left like everyone else. I worry about what we can do now, and even though western companies try to get away with whatever they can, face it, we do rein them in far, far better than the Chinese do with their "companies" (quotes because really, they are just another arm of the government when they want them to be).