On one hand, yes, you're completely right.* On the other hand, there is an obligation for something or someone to do the job of pointing out the info is wrong, and how and why. Even if it makes most of them believe it even more strongly afterwards, it's still worse for it to go constantly unchallenged and for believers to never even come across the opposition.
*(The same is true of left-wing conspiracy theories. It's silly to pretend that right-wing conspiracy theorists aren't far more common and don't believe in, on average, far more delusional and obviously false conspiracy theories than left-wingers do, but it's important not to forget they exist. I have dealt with some. They're arguably worse in some ways since they tend to be more intelligent, and so are more able to come up with more plausible rationalizations to contort their minds into pretzels.)
*(The same is true of left-wing conspiracy theories. It's silly to pretend that right-wing conspiracy theorists aren't far more common and don't believe in, on average, far more delusional and obviously false conspiracy theories than left-wingers do, but it's important not to forget they exist. I have dealt with some. They're arguably worse in some ways since they tend to be more intelligent, and so are more able to come up with more plausible rationalizations to contort their minds into pretzels.)