...the freedom and liberty you celebrate might erode the family unit that is the backbone of some other culture somewhere else. Who knows? Who are you to judge?"
On intellectual level I agree with this but not in the practice. There is certainly costs to everything but in this practice this means that some homosexuals get executed in name of "traditional values", people are not allowed to use Twitter in name of "keeping society peaceful" et cetera. Human societies consist of all kinds of groups competing with each other for status and resources, and usually a big web of shady beliefs are needed to keep those in power. Just look at the recent Snowden leaks.
But seriously though those (Indian tribes? Care to give real examples?) are extremely small costs compared to the world peace that Internet and spread of culture is pushing. Lack of communication between people leads to groups starting hostilities with each other. For example, I've met a lot of people from my neighboring country online that I would not otherwise. I think those relationships will help to promote peace between our countries more than any diplomats could. Similarly, I think Hollywood movies and tv-series will promote more peace in the Middle East than any of the war operations ever could. The only reason these extreme Islamists have power is that they protect their power hierarchies with strong rhetoric about traditional values, and a group of lies along that.