https://youtu.be/eVddGSTjEd0?t=51
Or maybe the explanation is that everybody behaved "responsibly" but they never got the changes they wanted, and chances for anything different looked more and more bleak. Why do you treat this like a single event? It is not. Lots of prior experiences fed into this.
For example, as bad as this is for us (I'm German, but I lived many years in the US once), for Europe I think it is good what is happening. Now we are forced to move and mature. Crisis are not always bad. The personalities involved this time make it especially hard to look at the whole thing calmly. I admit I have a harder time seeing what the US may get out of this except for the shakeup as a general chance. However, too much is concentrated on the personalities, and, like you did, on blaming everybody. How about Democrats look what they did wrong? I mean, other than reverting to "we didn't think the voters would be so stupid", in which case I have little hope for them to get anything positive out of this.