> Aren't the people you care about vaccinated?

It is not that easy. Some people cannot be vaccinated, for example measles vaccination isn't licensed for babies younger than 6 months AFAIK. So they will still be at risk from others who could have gotten vaccinated but didn't.

That's a bit of an edge case.

A major benefit of herd immunity is to help with the edge cases - people who cannot, or should not, be vaccinated, but would be in danger from these infections should they be exposed.

Vaccines aren't 100% effective. Google herd immunity.

Vaccinations are not 100% effective, and some people cannot be vaccinated.

The threat of disease isn't news, yet the constant propaganda against anti-vaxers is. People got exposed to measles in the past and the vast majority were fine. You can only get measles once and the odds of dying of measles is akin to the annual odds of choking to death.

The threat of disease is news when we've reduced the risk of it occurring so much that a great many people have never actually seen a case of it, so effectively 0 risk has suddenly become nonzero for anyone who does not have immunity.