(cross-posted from the Political Forum thread)
The bolded is not true.
The vaccinated CAN spread it? As in "it is possible"? Yes.
The vaccinated spread it just like the unvaccinated? Pretty much the same rates, percentages, etc.? No.
...
Fundamentally, the vaccine works by amplifying and - just as importantly - specifying a person's immune response. The mRNA vaccines are immune-system training tools -- your immune system is introduced to the COVID spike protein divorced from the actual virus itself. This allows your immune system to have (a) antibodies 'pre-built' in the event of an actual infection and (b) for your immune system to be able to 'remember' how to build the necessary antibodies on the fly in the future.
Now then. None of this functions like binary yes/no gates. Instead, everything is on sliders, like
a recording studio's sound board. Nothing you do as far as precautions or vaccines gets your risk of bad outcomes down to 0%. Conversely, nothing you fail to do gets your risk of bad outcomes up to 100%. Instead, dang near everyone (but not 100% of us) are working the in-betweens. You wear a mask indoors somewhere, that slider moves a good bit in your favor. You stay home a lot more often, same thing. Do more indoor stuff outdoors, also to your advantage. Vaccination is yet another advantageous slider move, and an especially potent one -- but still not getting you to 100%.
However, at a top-of-the-mountain society-wide level ... if a whole bunch of individuals move enough sliders to get themselves 90%-95% safe, then a wonderful thing happens. The math of accumulating probabilities kicks in and society, overall, enjoys near 100% protection. Even with maybe 10-15% anti-vaccine holdouts. Even with a similar percentage consistently doing the wrong things otherwise (no masking ever, frequenting crowded indoor places, etc.). 80-85% of the U.S. consistently doing the right things opens up a whole new post-pandemic word for everyone.
But it requires that many people willingly pulling in the same direction -- and frankly, it will require people to graduate from decision-making based on personal calculus to decision-making based on what's best for society overall. In a pandemic, in which
virions do not respect personal space or personal freedoms ... truly, no man is an island.