One problem with the indiscriminate/untargeted depopulation theory: remember there will always be certain workers that are essential to the elite: police and military to protect the elite and their property, judicial and government workers to recognize their legal rights (what would happen in an anarchy when people just occupy Bill Gates' farms?), scientists to continue developing the tech that has given them so much power.

And that is why the Masons seek as many of those people as they can. Don't underestimate the ability of secret societies to keep their kind away from the vaccine, one way or another.

Currently the vaccine is pushed to everyone without discrimination

Which is why USPS won't have to mandate it? More like it goes in line with what you are saying, they AREN'T pushing it on essential services for THEM.