I don't agree with your conclusion that public transit is responsible for assault and murder.
What you are essentially suggesting is breaking up society and isolating everyone so people can't harm each other. That is an extreme solution to this problem
You also forget about all the people suffering from cars: thousands of deaths each year (compared to how many in subways?) from accidents and pollution.
USB 3.0 Gen 1 and 3.1 Gen 1 and 3.2 Gen 1 are 5Gb/s, 3.1 Gen 2 and 3.2 Gen 2 are 10Gb/s and 3.2 Gen 2×2 is 20Gb/s. Then there's Thunderbolt 3 with 40Gb/s or 10Gb/s.
You may own your floor boards yes – wooden planks, formed by countless strands of molecules, though which themselves consist of nothing but nuclei and electrons –
I, however, have aquired exclusive rights to all of the vast real estate found inbetween those puny particles and I shall develop it into trendy nano-lofts and studios!
Self driving trains have been around for years