Whether it is reasonable depends on how much more likely a drunk or unvaccinated person is likely to hurt people. We have good numbers on drunks. We do not yet have good numbers on unvaccinated people.
Also, you may not have heard it, but I heard all over the place from "experts" that vaccinated people would not spread the virus.
At least few times less, up to few dozen times less. Like you said we don't know precisely how much. Drunk driver is around 13 times more dangerous as sober one. [0]
So what if some people are wrong? They are being corrected. Many places didn't allow vaccinated to ditch the masks. And I think nowhere they encouraged them to take unnecessary risk.
Even if vaccinated people just as easily infect other people as unvaccinated they'd still spread the virus less because they themselves are less likely to get infected with the virus.
Also, you may not have heard it, but I heard all over the place from "experts" that vaccinated people would not spread the virus.
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