They know it's a slippery slope kind of argument. If they start requiring vaccine passports then that means they will also require a full Federal ID card - which they don't want, until they can push it through to allow illegals and migrants to get the IDs, and to make it free for everyone to get one.

On top of that, they know if they try to pull a Federal mandate on this shit then the half of the general populace that has a brain in their head will throw an absolute shit-fit over the constitutionality of it. No, what they'll do is let the private sector horn in on it and be the bad guy. Want to fly on Airline X? Want to be admitted to Venue Y for an event? Better have your GoogleSoft Certified Health Passport ready to make sure you don't infect anyone or get infected. Don't want to participate in having to sign away access to your private health information? Then no flights or admission for you - and because it's a private business they'll lean on the whole "they can do what they want" pole, because in this case it's a thing they want the business to be able to do to us.

This shit is only going to get worse before it gets better.