Why are Democrats fighting so hard to vaccinate the reluctant?

Even though safe and effective COVID vaccines have been given emergency use authorization in the US, some people are still reluctant to receive them, over safety concerns, preference for "natural immunity," government distrust (whether rooted in misinformation or medical racism), or personal freedom concerns (AAFP).

Vaccination rates are higher in Democrat-led states, with Republican-led states like Tennessee and Florida firing important COVID officials.

Why are Democrats working so hard to protect the health of those who chose not to get the COVID vaccine? What, if any, is the public interest in strongly promoting societal choices to adult individuals?