Your right they are low. I see thousands of people riding every day and traveling with my Nurse bag into some seedy areas I’ve not had a problem in 30 years. Keep in mind millions of folks take public transport every day. There’s over 8 million people living in such a tight area, so yeah it’s amazing the amount of freedom there is compared to other cities, considering that the danger is low. Born and raised in Philly during the 60’s & 70’s and didn’t have a problem either. Sure they’re mentally ill folks but not as wild as some of the countries I’ve stayed in abroad.