Most people are intelligent enough to form views outside of disinformation. For the people that read disinformation, their minds are -- for the most part -- completely made up already.
People don't go from being Democrats or swing voters to reading an article about how Hillary Clinton feasts on aborted babies in a whore house she runs in Russia, to suddenly voting for Trump.
I mean, sure, some people do. But the vast majority of disinformation is reinforcing.
And it's important to spend money make them feel better about their wrong beliefs, even though it doesn't matter?