The reason there are so many conspiracy theories is because there was an obvious coverup of something. So many things don’t make sense. So many witnesses were completely ignored by the Warren commission. They had narrative and they culled the testimony to fit it.
No doubt it was handled poorly by all involved.
As for the rest of the stuff the Secret Service, FBI, LBJ, etc di or didn’t do, we will never know the reality until all those involved are long dead.
We all understand that most of what was presented in the Warren Report was fiction.