Personally, I think it should be criminal to sell a bike to anyone over 16 without lighting. Since we can't depend on people asking for years in a coma, I'ld also require reflective sidewalls on all tires sold in USA.

If we argue a bike is a vehicle, then it should have similar vehicle laws. At night: headlight, tail light and side clearance lights.

I know some will disagree, so I'll stop now, but simply make up your minds: are bike vehicles or toys. Your answer to that question will direct your answer to this question