Interesting perspective found here:
In the cold calculus of game theory, the expected response to this state of affairs would be to accommodate yourself to the growing strength of the opposing coalition—to persuade pockets of voters on the Democratic margins they might be better served by Republicans. Yet the psychology of decline does not always operate in a straightforward, rational way. A strategy of managing slow decay is unpleasant, and history is replete with instances of leaders who persuaded themselves of the opposite of the obvious conclusion. Rather than adjust themselves to their slowly weakening position, they chose instead to stage a decisive confrontation. If the terms of the fight grow more unfavorable with every passing year, well, all the more reason to have the fight sooner. This was the thought process of the antebellum southern states, sizing up the growing population and industrial might of the North. It was the thinking of the leaders of Austria-Hungary, watching their empire deteriorate and deciding they needed a decisive war with Serbia to save themselves.What's the lesson of Bob Dole and George H.W. Bush and John McCain, all losers in the general election? Was it just that they were beaten by better candidates? Was it that none of them could sufficiently rally the base? Was it that they all were older, and Americans love youth? Or is it simply that the pocketbook issues leaned towards the Democrat in those elections?
At varying levels of conscious and subconscious thought, this is also the reasoning that has driven Republicans in the Obama era. Surveying the landscape, they have concluded that they must strike quickly and decisively at the opposition before all hope is lost.