" Of course, there are many more examples.  My point is: that the inability to confess even harmless, simple mistakes, and to instead "double-down" and never admit "errors" is a critical flaw in a national leader... especially now.  It has shaken my confidence and has, almost certainly and irretrievably, lost my vote."

Well put.

Effective leadership requires humility in the face of the vastness of the unknown. To claim possession of the answer before an understanding of the question is folly.