Okay, so there's a house. Inside, an abusive husband is in the process of beating up his wife and kids.
"We've got to do something" says a concerned passer-by outside.
"I agree," says a liberal onlooker.
"Right," says the concerned passer-by, "wait here a mo..."
The concerned passer-by reappears in a suspiciously short amount of time with a fleet of bulldozers armed with wrecking balls, some petrol in a jerry can and a box of matches. The bulldozers set about demolishing the house while the concerned passer-by sets light to it.
Once all is quiet, the concerned passer-by and his mates raid the smoking ruins of the house for all the valuables that are still in one piece and unscorched, treading over the burned corpses of the wife and children as they go. They strike a deal with the husband (it turns out they are old mates of his and actually sold him the knuckle-duster he was using to punch his wife). In return for letting him live, he gives them his bank account details. (He's secretly quite pleased to be rid of the wife and kids.)
"Hmm," says the liberal onlooker, "that didn't go quite how I imagined."
Two weeks later, the liberal onlooker is passing another house in which another abusive husband is beating up his wife and kids.
The same concerned passer-by as before appears next to him.
"We've got to do something," says he.
"I agree," says the liberal onlooker.
"Right," says the concerned onlooker, "wait here a mo..."