Those occupying leadership roles who completely lack integrity are what we call 'Blind shepherds'. They are not really 'bad' leaders, because they are not leaders at all: they are misleaders.
There is the authority of position and the authority of knowledge - 'Authority flows from the one who knows.' But sharing in hardship confers upon a leader something quite rare - moral authority.
Integrity is the noblest possession. -Latin Proverb.