The crucial difference is that scientific theories are open to DISPROOF. The more open to disproof they are, the better they are, provided they survive the test.
Conspiracy theories, otoh, typically are closed systems incapable of being disproved to the satisfaction of believers. If evidence is found contradicting the theory, well, it must have been planted by "them" - the conspirators - to mislead the sheeple. But true believers aren't fooled by that, lol.
That's how it works.
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