Bias is often just a product of human cognition: i.e. one of the cognitive biases. Your environment is political, so your cognitive biases are tinged with politics.

It's also just as simple as experiences. even if we could remove all bias, we don't know what we don't know. aspects like language barriers don't help either in terms of properly sharing such histories either.

That's just stretching the meaning of the word "political" so broad that it ceases to have meaning at all. For an act to be political, it needs to engage with the environment with an intention to change or entrench it. If you include in your definition actions that are the result of a certain political climate, you have simply nullified the word.

> Everyone thinking politics is only about 2 parties and some controversial thinkg to even utter is the successful propaganda.

You keep making a point that no one is bringing up. Not only I don’t believe that, as a non-US citizen living in Europe I don’t even care about your two parties.

But there’s quite a stretch between “humans are biased” and “what you think about how society should work influences absolutely everything you do”.

As a silly example, I have quite a collection of music. I keep physical copies of the ones I think are more important to me. If a future archeologist were to find them, they’d get a biased picture of what people listen.

But my taste in music has nothing to do with my beliefs about politics. There’s artists there with every type of conviction, from different eras, from different countries,..

“Everything is political” is a great slogan for activists to get people to do what you want them to do, but like all slogans it’s not actually true.