In his first interview after WW1 Kaiser Wilhelm stated that the German people had "betrayed itself, its God & me", that "we would never have lost the war if the German people had remained true to themselves" and that since his betrayal, "notice how God scourges the whole world."

'I inherited a great and flourishing empire, but I myself was a mediocre person, not up to the job. And in the end, I failed the nation.'

Huizong, showing a little more introspection about his monumental catastrophe while Emperor in the 12thC.

Bonaparte vibes:

"The men of 1815 were not the same as those of 1792. My generals were faint-hearted men…. I needed a good officer to command my guard."

In the last days of his life Hitler raged against the 'universal treason, corruption, lies and failures' of his subordinates.