I used to believe it myself, but real truth, such as Lincoln urging passage of the Corwin Amendment, kept getting in the way.
Why had I never previously heard of this war fleet sent to force Charleston to accept a Union garrison at the entrance of their harbor?
I consider this bit of information quite important in understanding what happened, but in all the years of my life, until just a few years ago, I had never heard of it.
Why do they want to keep this aggression secret? Why isn't it taught?
Clearly it isn't taught because the powers that be don't want people to get the idea that Lincoln actually triggered the war himself, and did so deliberately.
And that is why no one has ever heard of this war fleet that Lincoln ordered into Charleston, thereby triggering the Confederate attack on Sumter.
It makes it look like Lincoln started it.
Because you weren't paying attention? Because it was right there all along.