The answer to that should be fairly obvious after Iryna Zarutska and Emily Carlson happened so recently. American and Japanese trains are not qualitatively the same. Vagrants and solicitors wander the local trains here like it is their asylum. Amtrak is a lot safer since they have conductors checking tickets, but that is still very loud and unruly.

If you'd like a more direct comparison to Japan, try Hong Kong, another place where I have spent a fair amount of time riding the trains. They also have world leading life expectancy.