Power equipment is not dangerous if you are mindful. I have had two close calls, both started by others stupidity and concluded because I was not mindful.
I not longer operate anything power when I am over tired. My one and only bad experience with an exposed power train takeoff resulted in me slamming into a tractor fender and the tractor stalling. Had it been newer bigger and more powerful, I would have lost my leg. I ALWAYS put the cover on the takeoff when I was not using it. Unfortunately, my father didn't, the jerk!
By the way, you can slice yourself very badly with a properly sharpened chisel and it has no motor.