Even if you're vaccinated, you can carry the virus to young children and the immunocompromised, potentially killing people. Let's say there's a healthy person who chose to not get vaccinated because they occupy what I call an "Information Sewer." Are you so angry at that person's willful ignorance that you're willing to sentence them to death?
A preliminary study has shown that in the case of a breakthrough infection, the Delta variant is able to grow in the noses of vaccinated people to the same degree as if they were not vaccinated at all. The virus that grows is just as infectious as that in unvaccinated people, meaning vaccinated people can transmit the virus and infect others.