I and others have talked about why January 6th (and all of the actions and rhetoric of Trump et al before and after, which needs to be included as part of it, as Jack Smith credibly argues in his latest filing) at length in various threads. I and others have particularised it numerous times, as have scholars, historians, prosecutors, and political analysts.
I don’t have the energy to go through all of it again, but I will summarise by saying January 6th was not simply the violent (and deadly) attempt of a mob to take the capital building and stop the certification of the 2020 election results. It was tens of other schemes being perpetrated in Washington and many states in tandem, many of which have lead to prosecutions and convictions of those that lead or participated in them. Congress members—and the Vice President of the United States—were genuinely and acutely in danger on 6 January, that alone is an attack on the institutions of democracy, even ignoring the fake electors scheme, the MAGA voting block refusing to certify the election results, the very near purge of the Justice Department to allow for the appointment of acting leadership who would reject the election results, the prevailing narrative on the right that the 2020 election was stolen (despite absolutely no evidence), and the many other local, state, and federal actions undertaken before, during, and after January 6th.
The flippancy shown by many toward the full depth and scope of January 6th is arguably one of the most dangerous outcomes of the failed insurrection and, in my mind, is the actual greatest threat to democratic institutions (and not just in the US). And that is not even a particularly novel or insightful stance, given we have seen many times in history what can occur when these types of actions are not taken seriously.
To look at January 6th as simply the failed attempt to take the capital building by an angry mob of weirdos is an exceedingly myopic, naive, and, yes, dangerous stance. And is exactly the one the worst elements in the MAGA (far-right and alt-right) movement have encouraged observers to take.