I agree that High Noon was not leftist and Grace Kelly was pretty enough to make it watchable by herself.
On the other hand, Louis L”Amour hated it. He said the idea of the whole town being scared and rescued by the lone hero was bunk. He said most of them would have been veterans of the Civil War and were not afraid of anything.
It is a common theme in Westerns, both movies and TV shows tho.
louis L’Amour hated it because it was so successful.