Make it make sense to me.
If both the vaccinated and the unvaccinated can spread Covid, why are only the unvaccinated being tested?
Well one aspect that I believe is being overlooked is the financial burden covered by the employer for unvaccinated vs vaccinated.
AFAIK, the rate of spread between vaccinated and unvaccinated is somewhat inconclusive at the moment (although reportedly less viral load amongst the vaccinated) but what is not up for debate are the health outcomes.
If an employer's productivity gets hit because of paid/unpaid sick leave, increased medical claimaints, and/or increased turnover due to current employees with strong reactions (or death) due to Covid19, it's in their best interest to force unhealthy decision-makers to jump through more hoops to engage in unhealthy behavior.
If unvaxxed people are more likely to end up in the hospital or dead, then any company that is interested in their profits would be smart to de-incentivize decisions that lead to poor health outcomes. That's why a shyt-ton of companies force you to sign smoking affadavits or take a hit on your health insurance premiums.
There are multiple ways to frame it, but the way I see it, the company is looking out for itself primarily and indirectly ''helping' employees that are too hard-headed to look out for themselves.