the Republican Party may no longer be a normal party. Over the past few years, it has been infected by a faction that is more of a psychological protest than a practical, governing alternative.
The members of this movement do not accept the logic of compromise, no matter how sweet the terms. If you ask them to raise taxes by an inch in order to cut government by a foot, they will say no. If you ask them to raise taxes by an inch to cut government by a yard, they will still say no.
The members of this movement do not accept the legitimacy of scholars and intellectual authorities. A thousand impartial experts may tell them that a default on the debt would have calamitous effects, far worse than raising tax revenues a bit. But the members of this movement refuse to believe it.