Because 8 months of harassment with nothing being done about it, that's why. I'd had enough.
In hindsight yes, I shouldn't have done it. But you know what? There's plenty of things that others shouldn't have done. Ye who casts the first stone, and all that.
But at least now we have the Community Interaction Policy, and it's being adhered to. May not have done myself any favours but at least the trolls are being dealt with now.