All the studies that showed ivermectin's effectiveness against Covid happened to be from countries with low levels of sanitation. The kinds of places where people are likely to suffer from worms without knowing it. If you have worms and Covid, and take deworming medicine, guess what? You're more likely to beat the 'rona. It doesn't mean the ivermectin cured you of Covid.
How do you come to this conclusion when the vaccine's effectiveness against transmission was never demonstrated in controlled trials, and very highly vaxxed jurisdictions like the Bay Area saw huge and persistent waves of cases?
Because there have been many many studies of the effect of the vaccine, in many different countries, by many different groups.
The results are overwhelmingly that the vaccine saves lives.
> saw huge and persistent waves of cases
This is a bad argument.
A vaccine can be useful, and save millions of lives, even if we falsely assume for the sake of argument that it doesn't reduce the amount of people who get infected or transmissibility.
I was prepared with 20 N95 masks (ten years old but carefully sealed for a pandemic.) Which didn't matter because the provincial care workers spread the illness like wildfire through my building (they were seeing clients willy nilly all over the place, with no PPE, and with rules that forbid them from taking a day off with a note from a doctor who's face they'd breathed into. Also with no PPE.)
The vaccination story was a big win; and that was the decision that counted. So science won, and govts got the one key choice right, China aside. Antivaccers, zero.