I took this while walking after midnight along the canals of Amsterdam. There aren't many places in the world I feel safe walking late at night, but this city is one. Maybe I am naive, but it's a good sign when you see all manner of people out walking at the same late hour, as though it was a perfectly normal thing to do. As I write this I am returning from a major American city where I spent a few days. To be honest I would not walk alone at night in that city. But Amsterdam is different in many ways.
I was discussing this with a friend recently and we were trying to put our finger on the essence of European cities like this. His take was, and this is a generalization, that Europeans tend to be more mature about things. I'm not sure about that but I'm willing to consider it.
Generalization break down as soon as you look at individuals, but at a macro level you notice differences. Maybe it also has to do with countries that are smaller and have a greater sense of altruism on a national level.
Smarter people than me will have a better explanation, but it's something I think about. And more than that it's something I'm grateful for as I visit and am able to walk around at night and take pictures.