The culture of any organization is shaped by the worst behavior the leader is willing to tolerate.
(Other Authors and Sources)
Steve Gruenert and Todd Whitaker, School Culture Rewired, ch. 3 (2015)
(Source)
Often misattributed as "Gruenter and Whitaker".
Quotations about:
allow
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He who does not punish evil commends it to be done.
Leonardo da Vinci (1452-1519) Italian artist, engineer, scientist, polymath
Note-books (1508-1518)
(Source)
In some versions, this is translated as "commands it to be done."