It really seems like it's safe to say that a fully vaccinated person's risk of dying from covid is low enough where based on the pre-2020 accepted societal standards for risk there should be next to no behavior modification expected.
How many times does this have to be explained before everyone gets it?
It is not all about you. There are other people in the world.
Masks and social distancing protect them, too. In addition, as others have noted in this thread, death is not the only bad result, here. Long covid is horrific, and even milder cases can have permanent health effects that are extremely undesirable.