You are either seeking to know the truth, or not. NO vaccine is fully safe, effective or necessary. We live on a flat stationary plane, in a dome, which accounts for our water cycle and phenomenon such as rainbows and sun dogs. Just saying.
You can feel the car turning though. Every regular plane trip goes through this process: taxi (level to ground), takeoff (at incline), level (except for turbulence, which you definitely feel), descent (at decline), landing (level). If your theory were true, then the higher altitude you fly at, the longer the trip would be.
I used an island I can see from my balcony, and found out it’s height (on public record). Then I used distance.to (as the crow flies) to determine the distance between where I was standing and the island. Then I used the altimeter in my phone compass app (held at eye height). Then I used about 5 different earth curve calculators, and all of them determined that, that island should be completely behind the horizon. But I can see it everyday, unless it’s raining. Then I re-did all the steps from different locations. This was after trying to debunk it, and then being on the fence for about 18 months.
Thinking flat earth is a psyop IS the psyop.