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Driver behaviour is the greatest cause of KSIs for all road users. Congestion exacerbates bad behaviour. This is actually observable pretty much anywhere, not just drivers on the road. Take a look at cyclists who come around the front of a group at a red light despite arriving later. Take a look at human behaviour when there's an evacuation in a crowded area. Take a look at skiers trying to get on a busy chair lift. It happens all the time. As soon as humans get into congestion conditions, a proportion of them will resort to self-interest and attempt to exploit opportunities accepting a compromise on safety, particularly the safety of others.
Why is that? Cycle numbers may increase while there are still motorised congestion levels -whatever you mean by that.
Drivers awareness and better behaviour around riders and likelihood of riders in the environment could reduce incidents