The vaccine does not prevent you from getting infected, it prevents you from dying if you do get infected. You can still pass on an infection to someone else. And if they have not been vaccinated that could kill them. You want that on your conscience?
Also, it is not clear how long the antibodies last after being infected or after being vaccinated.
Furthermore, evidence is that even 70% herd immunity is not enough to get the pandemic to die out. Famously a town in Brazil had that level and still have a massive deadly second wave. I am doing some research into this area right now with some other data and so far things are depressing. We may need to get 80% or even higher immunity. Currently no NYC zip code even has a 50% antibody positive test rate so we are nowhere near being able to think about herd immunity.
Besides, killing off the stupid is not something Jews should be advocating.