Because they were duped by the government to pay off their buddies in the pharmaceutical industry.

Probably because they caught covid.

Current boosters do not prevent omicron. Much of the vulnerable population is getting the boosters and then thinking they are more protected than they are. That means they are forgoing masks and visiting crowded places.

The pandemic isn't over. And the ratio of vaccinated potentials available to the virus vs unvaccinated potentials has changed.

From the link

But Weber says it's all a matter of perspective. The current count is still about one-tenth of what it was during the worst of omicron.

"Keep in mind that number of people hospitalized is way down," he said. "Small numbers make big percentage changes."

"We don't want this to sound like the vaccine doesn't work," said Dr. David Weber, an infectious disease specialist at the University of North Carolina's School of Medicine. .... but the vaccine doesn't work. Natural immunity works.