Korea also saw almost nonstop protests since Yoon came to power - TBH I think there was always some part of Korea protesting the government, since forever. But you can't just kick out a president for being hugely unpopular - they must do something so drastically and flagrantly unconstitutional that the majority of citizens must say "Yep that's unconstitutional, we have to drag him down because our Republic is at danger."
Whether you like Trump or not (I don't), Trump of 2016/2017 did not meet the threshold. (Half of America had just elected him, what would you expect?) I think Jan 6th clearly met the threshold, and Biden should have seen that Trump ends up in prison. He somehow didn't - I get that precedents are important in politics and America had never seen an ex-president in prison, so would have been very controversial - but I think it was a wrong decision and America is now paying the price.