This is just a gush of fallacy from you - either sincerely or insincerely obtuse. So Brexiteers promised a great Brexit. May promised a great Brexit. ... And Brexit (surprise surprise) has turned out to be utter ****. Some people might be the sort to say, "Meh. I got mugged. I guess I just need to pay over the money, even though the goods are nothing like what was promised." But many MPs are actually pretty determined to do right by their constituents. And they're not quitter-types. They agreed to vote for "great Brexit" and they're still fighting your corner, to get that "great Brexit".