are there any conspiracy theories that turned out to be correct?
yes, but whether you accept the truth is up to you.
heres a big one involving litereally millions of people. they should all go public right? wrong, most of them think they are on the right side and they are only involved in doing their small part to keep it going. The teach false knowledge to people and virtually enslave them, altering their personality, thinking and mindset in the process. they destroy families, friendships, lives. the are involved in human sacrifice (blood issues and others)
you may have heard of it, its called Jehovahs Witnesses.
Appealing to the authority of MythBusters is really quite silly. The myth of the infallability of MythBusters has been debunked but the best part is the who dunnit. It was on their own show, admitting they were wrong after a viewer proved it to them. So lets not appeal to them to prove anything beyond how entertaining TV really can be.
This next item doesnt fall into the realm of theory since it is self admitted by the perpetrators. False flag attacks. Im not going into the "CT" ones but just look back at history and the ones that are publically admitted and the ones that are publically admitted to have been planned. That should tell you something about the willingness of people to do these things. lets not extrapolate that to mean more though.
Lastly, just because you reject an idea does not in itself make it false or theory.