There must be people within the parliamentary and apparatus of the Liberal Party in Victoria who would be worried that they'd be helping conservative nutters get power.Wouldn't you rather he stayed in parliament then?
Perhaps many of them would rather see the ALP win than the Liberals win, if it meant they conservative wing took power, like what happened in the federal Liberal party.
If the Libs do win the next state election, it'll include a dozen or more new Liberal MPs. If they're 8-4 nutters, then the nutty branch will essentially be in Government.
People like Matthew Bach must wonder "Why am I helping these nutters take over Government when I share more values with the ALP?".