Better safe than sorry.

The risks of electric are different from the risks of glow or gas power plants. I might argue that with electrics there is less need to routinely put your body parts in the vicinity of the propeller.

I would not dismiss the capability of a glider to cause bodily injuries either. A glider fuselage, or a molded wing in the face at anything from 20 to 100 mph would be no fun at all.

Have fun but do not get careless.