When too many dumb questions get asked, you tire out the listener and they tend to stop engaging you in the debate. If you then bring up valid questions, they are too tired of the dumb questions that they just don't care enough to listen. Thus, they miss out on learning something valuable because they've been given too much flimsy evidence, which destroys the credibility of the person giving the information.
Free market capitalism isn't right for America because it works better. It's right because it's free (and it works better).