I do think part of the issue is that you might not see actual violence on a train, but you might see some behaviour which makes you feel uncomfortable. Because you’re in a carriage with maybe 100 other people, then the likelihood is less that you’re in any actual danger, and far more that you’ve witnessed an incident which makes you wary. Meanwhile, there are several car accidents daily, but it’s witnessed by maybe 20 odd people, and most people only see a slowdown of the road.
I do think part of the issue is that you might not see actual violence on a train, but you might see some behaviour which makes you feel uncomfortable. Because you’re in a carriage with maybe 100 other people, then the likelihood is less that you’re in any actual danger, and far more that you’ve witnessed an incident which makes you wary. Meanwhile, there are several car accidents daily, but it’s witnessed by maybe 20 odd people, and most people only see a slowdown of the road.