You have so much believe in authorities that even if proven they didn't do their job, you still trust in them with your life?
They might not always do their job the way I want them to, but there are no other authorities in this case to go to for a second opinion.
Otherwise I have no idea how you could even remotely compare these two situations
Now, the situation is a bit special now that there are efffectively TWO competing authorities. It's not that there used to be just one, but that one used to be the authortitive one (or that they spoke with one voice). This complicates things. So OK - when there are conflicting information I might trust the cautious one. But for all practical purposes, these authorities are opaque to the average traveler. I must either trust them or stay on the ground.
Also, since you can't know which flights are using which planes (usually), many carriers use thes planes interchangably with non-MAX (737-800s), and you can't use the choice of plane as a reason to get a refund on your ticket, avoiding these planes is likely expensive. You need to fly another route, pick an airline that isn't the cheapest for the leg you are flying and so on. I mean I'm as scared of crashing as the next guy but I'm not "5% more expensive trip"-scared.