"and a studied relaxed demeanor, very bizarre"
Not at all.
He (or she) has successfully conned their manager into believing their BS and neutralized or enrolled HR into their world view. They have a license to treat their staff like s**t and know they can keep on getting away with it as long as they can persuade or coerce any key subordinates into continuing to do their job for them.
You see the chaos and financial ruin they bring and think "How can we fix this"
They think "Who can I blame for this and how can I get a pay rise out of it?"
Psychopaths don't get why "It's bad" and they don't care about your feelings, unless of course they are manipulating them to do what they want you to do.
And as it's a severe personality disorder, not a disease, it's viewed as incurable.