Whether or not mandating this particular vaccine is a good idea on balance, I don’t think that employers are the right group to be independently determining them. (If society wants to implement them, do it via the government. If that implementation includes a check at school enrollment or by employers as a compliance mechanism, fine, but leaving vaccine mandates to individual employers is about as crazy as leaving them to individual schools.)
* I’d be curious to see a 2x2 grid of pro-union/anti-union and pro-mandate/anti-mandate. I suspect there is a more than 25% of population in each of the pro/pro and anti/anti camps, making me think of that meme with the guy sweating in front of buttons labeled “Right of Workers to Collectively Bargain” and “COVID Vaccine Mandate”