One of the curious things about the American political discourse is that two roads running in fairly opposite directions are somehow expected to meet up again after some mysterious number of miles have passed.
Consider it in other terms. A job interview? Why would you hire the candidate who says the job he’s applying for is useless and can do no good?
A product salesman? Would you really buy the product if the salesman insisted that it didn’t work and wasn’t worth the money?
I think of Homer Simpson: “I kicked a giant mouse in the butt! Do I have to draw you a diagram?” That is to say, it shouldn’t require a cartoon to help people figure this out. Some things really are that obvious.