Okay. Hard hat donned.
If you want my conspiracy theory it's that a lot of these conspiracy theories are fabricated by people who know it's completely fabricated so that any talk remotely related to an issue is dismissed by rational / sensible people without a second thought.
So... for example: This was created in a lab as part of a nefarious plot by China to take over the world. Sounds absolutely bonkers. But the question of wether this might have accidentally escaped from the institute of virology is really not as bonkers. And when you get into the gain of function research previously banned in the US, you start to see potential motives for why they might not want people asking questions.
Another example for the sake of argument (since it's been mentioned on here: This is all Bill Gates attempt at world domination. Again, absolutely bonkers. Any mention of Bill Gates on a covid thread is quickly laughed away. But. There are some important questions to ask about the power and influence wielded by a single man. Bill Gates opening remarks at the global vaccine summit. Bill Gates on the anti-vaccine movement. What's inside coronavirus vaccine - Bill Gates interview. All top results on youtube and one could argue perfectly valid for a philanthropist billionaire to comment on. The man obviously wields power and influence. But when he's making it clear that the rich half of the world must not share patent information with the poorer part, that they must not be allowed any part of the manufacturing process... then it becomes slightly less bonkers to ask questions around just how much power and influence this man has.
So there you have it folks, my conspiracy theory to end all conspiracy theories. I'll put my hard hat over my tin hat 