This is widely speculative but I think Cluster B disorders are result of poor parenting. In most cases, parents themselves were having the disorder and hence not able to take care of the kid properly and then the kid ends up becoming like a parent. It's a vicious circle.

Parents need to introspect a lot before parenting. They need to be aware of their weaknesses, complexes, where they lack and ensure the behaviour stemming from their issues is not affecting kids negativiely. But in an age where everyone is focussed on their work and getting ahead parenting is not taken seriously and is even outsourced to third party.

Forgive me if I'm way off here.