I know, "profit" is a dirty word. But the people promoting public health policies have very little connection with vaccine makers profits. I think vaxvaxvax because vaccination is the most successful thing we have. In the last two years, people have spent all of maybe 6 hours to get vaccinated two or three times, and it keeps almost all of them from getting seriously ill, from dying, or from getting Long Covid. Nothing else takes less time and is so successful, by far. On the other hand, people get tired of isolating after several thousand hours. They get tired of wearing masks every time they are out of the house, some for hours a day being essential workers. They get tired of staying six feet apart. They get tired of never getting together with family. So they take calculated risks, and sometimes that doesn't work out the way they wanted.

People who are vaccinated can't get tired of that protection and take a risk to do without it. Antibody levels contract naturally, but T and B-cell memory remains.

As for the aerosol vrs droplet question: If smaller aerosol particles travel deep into the lungs, and aerosol is the major route of SARS-COV2 infection, then why are so many infections asymptomatic or occurring in the nose? Simple: Most infections are through droplets, that primarily stop in your nose. Deep lung infections are present in about 1% of SARS-COV2 infections.