Scooters are a plague (and this bike is classed as a scooter, unfortunately, so I'm lumped in with the worst), but a bigger danger is mobile phone use by cyclists. That's roughly 1/3rd of all the adults and 2/3rds of the teenagers here.
Or by pedestrians!
My brother curses the number of pedestrians in Glasgow that cross the road while looking at their phones... they're by far his biggest hazard.
Everything else is so tiny as to not count.