Although
in principle, I imagine (or, at least, would hope) the reason no one bats an eyelid, is because it's generally recognised that today's
main roads are, for the
most part,
unsafe for cyclists - due, of course, to the sheer
volume of motorised traffic using them.
Inevitably, from time to time,
you
do come across reckless, idiot cyclists who are, at
best, an inconvenience - and at
worst the cause of serious [or even fatal] injury - to pedestrians walking on pavements and footpaths but ...
...
usually the dangers are relatively minimal compared, for instance, to
road accidents.