Clark a "return to Muldoonism" - Moore

Former Labour PM Mike Moore wonders whether current Labour PM Clark represents a "return to Muldoonism."

This politics of personal destruction is fearful [says Moore]. Why is Labour so good at it? Because we practise on each other.

I'm sure we've all noticed the predilection for a certain area of the political spectrum to attack the messenger while ignoring the message altogether, and with the Clark Government this septic strategy has now become habitual. Does Moore's simple explanation account for that sufficiently, do you think -- that they just like fighting each other? Or is there something more fundamental to explain?