The differences between vaccines in 1915 and now are of such an order of magnitude that saying people shouldn't get vaccines because some girl in 1915 died from a smallpox vaccine is like saying we shouldn't live in cities because large percentages of the population were dying when cities were in their infancy and urbanization was just occuring, or that people shouldn't work in factories because of the extremely unsafe conditions of the early 1900s.

The situations then and now are completely different, and using this as an argument is extremely misleading.