You don't know that. That's just what you want to believe. Since I know it would be a waste of time with you, I won't bother to cite all the evidence of illicit pre-autopsy surgery, of two extra bullets being found during the autopsy (one in the sheets wrapped around JFK's head and on in the limo), and of the receipt for a "missile" found during the autopsy (which missile later disappeared and was covered up with the explanation that the federal agents used the word "missile" to refer to fragments--sure, happens all the time).
OMG!!! I didn't even think you were gullible enough to believe that ridiculous story of post-mortem surgery concocted by David Lifton. That is probably the nuttiest conspiracy theory anyone has ever come up with. No one who takes that story seriously should themselves be taken seriously. That includes you. You seem willing to swallow just about any BS story as long as it claims there was a conspiracy.
For those who would like to read some of the evidence of extra bullets and missed shots, please see my article on the subject:
https://drive.google.com/file/d/1WRwhDQ9HMydf5pICsHwgtkoNKw0YSO8T/view?usp=sharing
BTW, why haven't any of the SBT wound ballistics tests, even some of the markedly rigged ones, been able to duplicate the SBT, i.e., produce a bullet that did the same amount of damage that CE 399 allegedly did and emerged in the same virtually pristine condition as CE 399? What's up with that?
Oh, sorry, I forgot that you reject the science of wound ballistics testing when it comes to the JFK case.
Yeah, never mind that Connally said he was certain he was not hit before Z229. Never mind that his visible reactions that start in Z238--the right shoulder drop, the puffing of cheeks, and the pained expression--were involuntary reactions that would not have taken more than four frames to occur after he was hit.
Never mind JBC flipping his arm upward at Z226 which coincided with JFK starting to raise his arms in reaction to being shot. You dodge this inconvenient fact every time it is brought up because you have no explanation for it.
And are you ever going to explain how you can still believe in the SBT when we know there was no hole through the tie and no nick on the tie knot's left edge?
Whether the bullet did or did not nick the tie upon exiting JFK's throat is not an essential element of the SBT. I believe it did, but the SBT works either way.