Only because the unvaxxed have comorbities. Healthy people rarely die whether unvaxed or vaxed.
Overall mortality rates among unvaccinated persons were 14.1 times the rates among bivalent vaccine recipients; mortality rates among monovalent-only vaccine recipients were 2.6 times the rates among bivalent vaccine recipients during the late BA.4/BA.5 period.
https://www.cdc.gov/mmwr/volumes/72/wr/mm7206a3.htm
According to CDC, people ages 12 and older who have had a bivalent booster shot have a 15 times lower risk of death than an unvaccinated person.