Tricked and lie to, lol. Of course vaccination reduces spread and transmission. It's just that its effect on that is temporary. But so were most vaccine mandates. Once the infection rate between vaccinated and non-vaccinated began to move towards parity with Omicron, most mandates were removed relatively quickly. Some employers kept them, but they're entitled to do that and I'm sure some find it's a useful way to filter out whack jobs.
As for focusing solely on at-risk people, about 1 in 250 unvaccinated 30-49 year olds in Alberta were hospitalized with COVID in the first few months of 2022. By comparison, about 1 in 4,000 30-49 year olds with 3 doses were hospitalized. If the unvaccinated group had the same outcomes as the vaccinated, that would have been probably 3-400 fewer hospital beds (after accounting for with COVID vs. due to COVID) taken up in a relatively short period of time. Why wouldn't health authorities try to convince everyone to get vaccinated in light of that? Particularly given that probably half the population meets the threshold of having a single condition in that study above (obesity, hypertension, etc.). Not to mention, that study looks only at ICU and stepdown units, so it's not capturing regular hospitalizations.
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