> My grandmother never locked her door when she was at home
This whole 'golden age' of Sweden is just such a bunch of bs.
Take a look, for instance, at this article about a part of central Stockholm which is now extremely expensive real estate:
https://skarn.se/hans-marmbo/ (in Swedish)
I thoroughly recommend running the page through Google translate or DeepL for an insight into the reality of Stockholm just 50 years ago - it's a fascinating and horrific account of drug addicts and lowlifes brutally murdering each other in terrifying and depraved ways.
(DeepL translation:)
"Prostitutes, alcoholics and drug addicts moved in next door to students and underpaid casual workers. Pickpocketing, knife fights and burglaries became commonplace, and neighbourhoods once considered stately could now have been lifted from a Dickens novel. In the press, the area was called the swamp..."