People are afraid to say their opinion because of the backlash. Not everyone has a well thought out opinion, that doesn't mean they deserve to be punished. The human experiment can only move forward with open displays of ignorance coupled with open-minded discussion and acceptance.
It's idealistic to think this could happen easily, but I see no other way for global civilisation to come to terms with our historical cultural differences.
We're either going to devolve into systems where nothing matters and everything goes, which frankly we already have with 4chan, or allow certain views to prevail over others, which literally every forum or approval-based channel has these days, or find a different way to share differences and come to terms with them, which I hope somebody invents soon.