[q1w2]

Even political and historical events that you would not think are controversial have become biased.

As an example, there are some Wikipedia editors that continually remove mentions of genocide from the opening paragraphs of Stalin's page, whereas they leave them there for Hitler.

People really enjoy pushing their ideology in their spare time. I really don't understand it.

[DiggyJohnson]

I think choosing the personal and political like of Stalin as your "political and historical events that you would not think are controversial" is a very, very poor example. It's very controversial and still impacts the lives of ~1 billion people.