Darwin Award applicants?

More and more people are oblivious to much of the technology around them today. They don't care anymore how things work. There is a platform and railroad tracks. It is a Metro system of a large metropolis. There are no overhead lines. How is this train powered? Obviously with the third (power) rail. It has to have deadly voltages to move a train weighing hundreds of tons. Actually, every 6-year-old child should come to this realization through observation. Chicago built an electric transportation system very early on, before safety was a concern. People back then were not so irresponsible and careless. In the Berlin subway, the oldest routes from the 1900...1920s also have such non-covered power rails (750V DC). The newer mostly above-ground S-Bahn routes (also 750V DC) from the 1930s have covered power rails contacted from below. Should one convert more than 100-year-old metro systems for billions of dollars to today's safety standards because more and more crazy, careless people are walking around in this world?