It is also common for cyclists to use cable locks until the first time their bike is stolen.
And then they learn that cable locks do not work.
D-locks don't work either, since thieves discovered battery-powered angle grinders
If cycling is to be a significant part of the future of transport, we need to solve bike theft.
On the other hand it might take multiple thefts to learn the lesson for some people. When I was a kid/teenager, someone stole my bike and the police found it(yay small town) abandoned several blocks away. Of course it took my sister and brother-in-law pretending to steal it for me to really learn.
It's _very_ common for cyclists to use bike locks even if they personally haven't suffered a bike theft.