“data shows experimental substances don’t prevent infection and transmission”

IRRC the studies showed a 60%-90%[1] reduction in hospitalization, not a reduction of infections. IIRC, there is an inferred reduction of death because of the reduction of hospitalization, but it's very difficult to make a big enough RCT with enough death to be statistically significant. IIRC some people claim reduction of transmission because the vaccines reduce the virus load, it's plausible, but the evidence is not hard enough for me.

> industrial and alleged military secret regarding the ingredients and the mechanism of these injections.

IIRC the FDA and the equivalent agencies in other countries get the complete list of ingredients, there are not secret parts like in Coca Cola. Also a good chromatography can reveal all the secret ingredients.

The mechanism is very well known, it depends on the vaccine anyway. I don't understand what they mean.

If someone doesn't like the new fancy RNA vaccines, perhaps can try to get one of the old school vaccines with "dead" virus like https://en.wikipedia.org/wiki/Sinopharm_BIBP_COVID-19_vaccin... They have a lower reduction of the hospitalization rate, something like 60% instead of the 90% of the RNA vaccines like Pfizer/Moderna. [2]

[1] It depends on the vaccine.

[2] Or a vector virus vaccine, that are somewhere in between of the effectiveness and classic-fancy scales.