When two people claim there are evil Martians living in the basement, and you have a XOR decision point, the difference between one saying to placate the Martians the house must be destroyed and the other saying to placate the Martians only the kitchen and bathroom(s) need to be destroyed is important.  With the latter at least the walls and roof are still there.

During the Bush administration the crazies have spent much time and energy tearing down the house.  During the Clinton administration only the kitchen and bathroom(s) were 'reformed.'  People, naturally, look back at the period when the walls and roof were still there and say, "Gosh it was nice when we still had walls and a roof and wouldn't it be great to get them back?"

Expanding the analysis --- ;-)

Since both parties depend on wide acceptance of the proposition there are evil Martians living in the basement for their existence neither looks kindly on those pointing-out there is, in fact, no evil Martians living in the basement but there are problems with the oil heater in the basement, the water pipes are clogging, and summer is coming on and the air conditioner is broke.  Naturally the parties, when getting this looks at the one making the argument and either flatly denies there are problems with the oil heater in the basement, the water pipes are clogging, and summer is coming on and the air conditioner is broke or, the slightly less crazed, says "Yes, there are problems with the oil heater in the basement, the water pipes are clogging, and summer is coming on and the air conditioner is broke BUT there are evil Martians  LIVING in the BASEMENT!"  

shrug

Ever since I learnt about confirmation bias I've started seeing it everywhere