Two bicycles over ten years compared to how many you would get stolen in the US is "nothing".
That's the problem when comparing crime rates in the US and Japan, people in Japan still feel like there's tons of crime. I suggest you spend a couple of years living in a large US city. I hear San Francisco is very nice.
There's a lot of cultural difference to factor into the analysis. I think the article holds true for the U.S., and especially the Bay Area. I've had my own bicycle stolen there (despite a hefty U-lock).
If you are charged, you can choose a no-jury trial, or a jury trial with no right to appeal; and Japan has an extremely high conviction rate (though few people are actually charged, the prosecutors are very selective).
If you see a laptop on a park bench, you either leave it or call the police. If you pick it (to check the browser for the owner's email address) and a policeman catches you with it (and they don't need a warrant or even good cause to search you), you can undergo a lot of hassle.
Or just plain old boring regular enforcement, like Germany and Japan have, which is how they end up with a far lower crime rate than the US or the UK for example.
(They also have a better social safety net, that's part of their low crime rates too.)