...Has Abnormalcy Bias does not - Automatically - equal "Believes in Conspiracy Theories"...
Personally, I would state the above, as-edited above - which is strictly My Opinion.
For me (again, personally..) a bias towards Abnormalcy bias is what Helps me, actually, sieve-thru what are clearly Theories (ie: 'shape shifting lizard people' are the ones really running things ) - from what are clearly Actual Conspiracies. I may listen to the 'theories' (and listen Well..) but then compare the Anecdotal - with the Empirical - and then with History - to arrive at a 'net-weight'.
..But the notion that 'Everyone, everywhere, would Have to "be In on it", for [conspiracy X] to really Be one' is, Imo, more of an example of Normalcy bias, and that is Exactly what those who foment actual conspiracies (ie: the Cee Eye Aye, et al..) bank on to achieve success: En masse 'dismissal', because 'no way Everyone-necessary would be 'in on it'...
To the contrary, 'Occams Razor' applies here as well, because even IF there were scads of astute-enough people (to 'run the math' on what was being proposed / going to happen..) who were also Bold and articulate-enough to 'whistle-blow successfully', well.. Propaganda / disinfo is SO powerful a Machine, now, that even those 'scads' would be quickly, and summarily discredited / disavowed, probably disciplined (ie: all those Fired for 'daring' to simply want More Data, before they were willing to accept an Undeniably-experimental medical treatment, etc..) and, heh.. maybe Some would even end up defenestrated.
I submit 'Exhibit A': Musk cracking open Casks of nefarious - and Clear - conspiracies, which have been roundly dismissed as 'Right-wing Extremist theories', by those so-embroiled because... Well.. 'because we Said So,
I shall rest it there, but.. I heartily-concur: Biases are usually the Greatest threat to success, and often, even Deadly.
jd