How do you handle going outside when there are random people in public, in stores, on the street, at work, who do not believe in vaccines?

Vaccines don’t need to be believed in, they’ve worked and will always work. If the number of these people is large enough to prevent herd immunity, then I do so oblivious to their absolute callous disregard for sick children and the elderly; I simply don’t know that they’re awful, shitty people who claim to be human beings, who could so very easily save the lives of these sick children, yet refuse to do so, really just because they can, and it makes them feel superior.