1) Given that those succumbing to group think and confirmation bias are generally unaware of their biases, how would we know that we are not experiencing something similar now?

2) What are the implications for civil liberties, if the state targets political opponents of the current administration?

3) Could these issues be resolved targeting political violence generally, instead of making partisan pleas and accusations?

4) If political extremism & intolerance are issues driven by the contentious political environment, are these partisan blame games contributing to the climate of toxic political divisiveness or helping to resolve it?

Could 'these issues be resolved targeting political violence generally, instead of making partisan pleas and accusations'? No -- in factual reality world, there is an ideology which is responsible for the problem, and so it seems sensible to focus on that ideology. https://www.theguardian.com/world/2020/oct/22/white-supremac...

"are these partisan blame games contributing to the climate of toxic political divisiveness"? I'll tell you what's contributing to the climate of toxic political divisiveness -- overwhelmingly, the right wing, its conspiracy theorists, and their enablers; see, for example, qanon/8chan, the count of trump's lies while in office. These are radical outliers. Let's worry about that before we start worrying about the impact of us complaining about that.