That's narcissism.

The thing with narcissists is that they're extremely confident. People love confident leaders, even if they're terrible in every other way.

As the recent US election has shown, it's not what you say - but how you say it, that counts.

Hell, you see this with startups, too. When a founder appears extremely passionate and enthusiastic, pitching something as if they're at the top of the world, investors are willing to suspend their disbelief.

One can get away with lots of things, if you're just confident enough.