Good point hurray.but the fact is sherpas don't have any authorities to ban anyone , not at least legally. Only Nepali gov can do that.and Nepali Gove don't care anything as long as the foreigners bring money and with that money they can go foreign visit and increase their job benefits. I have also heard lots of sherpha lost their lives few years ago because some arrogant westerners would not listen to them. Would be nice to know what provoked ,although violence is not accepted matter what.