I can understand why people don't cycle so much in the UK. The climate is crap mostly and the roads are crap mostly. Car drivers are scary.
Even though driving standards are supposedly some of the best in the world but there are just too many cars. I began cycling many years ago and have noticed a year on year rise in car usage, and I would also be slightly concerned if I were starting to use a bike today.
It is not only poor infrastructure and accommodation for bikes and cycling, overall there has also been a total erosion of consideration for that other main user of highways and byeways, namely the pedestrian. Walking around Edinburgh is not a joyful or pleasurable experience at all, the whole place runs on car drivers and their needs. On the whole I find it less frustrating being a cyclist in Edinburgh than being a pedestrian, traffic lights being my biggest bug bear as a pedestrian. Pedestrian/pelican crossings all over the place as well as lights at junctions, no islands in the middle of the roads at junctions or otherwise, stuff of nightmares.
Fear is possibly the biggest factor in people not getting onto bikes. The H&S brigade have gone too far and made it into a REALLY dangerous past-time/hobby. Cycling is no longer promoted at schools by and large. All of the above are contributory factors to bike use not picking up more.
Personally I also find using public transport, particularly the buses, time consuming, unsatisfactory, and unpleasant for any number of reasons, that I would just rather not share the space with some of the other passengers and that is a VERY good reason for using a bike for me.