Glasgow in the 30s was dreadful for gang warfare, known as "Scar city" and not much better in the 70s. Cleaned up a fair bit now.
Slum clearance in London of housing so poor and so riddled with poverty and crime, that started back in the late 1800s.
The Krays, East end 1950s...
Its always been bad, maybe some bits now are worse, maybe some bits are better but you balance town V country, bustle V calm.
Oh, and the sun shone a lot more when I was a child too