The variable of "breakthrough / non-breakthrough" is binary: either the virus infects a patient who has not been vaccinated, or a person who has been vaccinated. That is very important information. Cases of patients who have been vaccinated and develop covid anyway demonstrate by definition that the vaccine did not prevent spread of the virus to that person. Then, depending on the level of symptoms manifested in a given patient, some of those who contract the virus (even though fully vaccinated) will go on to spread it to others. In other words, some portion of breakthrough cases are still vectors for covid transmission. Given that these new cases come from vaccinated people, there is no reason to believe they cannot infect other vaccinated people. Instead, it is likely that the form of the virus is now adapted to survive and replicate in the presence of the antibodies the vaccine leads the body to create. This is what the Delta variant is. It is an adaptation of the virus that appears to be ready to spread among vaccinated and unvaccinated alike.

The vaccine did not prevent this variant from taking hold, even in countries with very high vaccination rates. You and I have clashed over this multiple times. Covid is a highly adaptable pathogen. Pfizer / Moderna / J&J / etc have not figured out the magic bullet they claim to have done to stop it.

I would go a step further (in alignment with Robert Malone and Geert Vanden Bossche) and say if you create a "vaccine" that doesn't actually eradicate the virus, which the evidence is 100% clear that these therapies do not do, then you are actually creating a pressure on the virus that will only make it worse, as you give it more and more information to adapt around, which natural selection will then translate into a hell bug against which we are even more helpless to fight than Covid was in the first place.

First Do No Harm. The experiment we are engaged in is a wildly dangerous proof of that age-old adage. It never occurs to Fauci et al that perhaps, just perhaps, the "solution" they are so passionately promoting is going to be far worse than the results would have been had they let the virus run its course modified by the collective natural immune systems of humanity without the influence of their "vaccine" fucking around with it.

The lack of consideration of the possibility that the null-hypothesis (in this case, continue to treat the various Covid syndromes post-infection rather than try an absolutely brand new untested gene therapy technique to interfere with it) might yield better results is a tragic weakness in the global science community generally, and in this case, we have the potential to witness a truly terrifying consequence of that failure.