Bikers who are a danger to others

Returning from Newark yesterday afternoon I witnessed three dangerous incidents - all of them instigated by people on high-powered motorbikes. One avoided a crash and death by inches having overtaken on a blind bend at a speed I would estimate to be approaching 90 mph. I couldn't care less about someone who is that moronic killing themselves. But what I do care about is the danger they pose to other motorists and pedestrians.