Is there any proof that Hamlet is NOT about bad parenting?

I'm writing on, what I find as, a tough topic. I need to find why Hamlet is NOT a play about bad parenting. I found lots of reasons why it is,but can't find anything else. I know Hamlet isn't just about bad parenting, there's the theme of indecisiveness, revenge and madness. But I need to find a way to link it back to why its NOT about bad parenting.