I believe the chance of hurting yourself with a spinner nob is less than winning the lottery 50 times in a row. But hey, if you're the no-risk type, so be it.
It’s not a problem until you’re in an accident and hit the steering wheel. It was probably more useful before power steering.
I'll bear that in mind if I want to become totally risk-averse. In which case, I probably wouldn't stray from my padded room.