He speaks low level truth and mingles it with lunacy, while acting crazy, so they have an easy target to point and say "You're going to believe that guy?!?!".

Or even worse, they target a real truth speaker and say "see, this person speaks stuff that are really close to what that Alex Jones guy says, I'd disregard anything they have to say, they're probably crazy too" and the sheep do just that, God forbid people think they are crazy, they can't handle that.