entire state hospital systems (e.g. Alabama, Florida, Georgia, Mississippi, Michigan) were so overrun that they were near maximum capacity, or needed to transport COVID patients to neighboring states...that's a serious problem...
If the attached link does't get you to change your mind, I'm not sure what will...
Link: https://ourworldindata.org/grapher/united-states-rates-of-covid-19-deaths-by-vaccination-status?country=~50%2B