I am much entertained by this theory, but can you explain how the heir to the throne could possibly be bullied? For sure, some kids are not scared by the prospect of detention at school; but if the crime for bullying be hanging, or being pulled apart by horses, I can't really see how young Helm would be bullied.
Is this more anti-Rohan propoganda, that 'they're all violent and uncivilised there'?