Just make sure the organization's objectives are aligned with the interests of the leader.
Most organisations (I spell UK) have some sort of collective purpose otherwise they wouldn't be organisations. Inherently opposed to the selfish objectives of the psychopath.
CEOs get their bonus by raising the stock price.
Often temporarily, only for it to tank right after they deploy their golden parachute. Or even before, they design it to work either way. This bonus idea was invented in the 70s. Even some business professors have started to notice it hasn't always worked out.
why do they keep voting for them?
Successful psychopaths are charming and good liars. People want to believe it will be different this time. Only psychopaths get to stand. Psychopaths know to tell people what they want to hear. Most people, it seems, cannot easily spot a psychopath. If they realised their candidate was a psycho they (mostly) wouldn't vote for them. I hope.