12-year-old Tamir Rice was shot in November 2014, by police who mistakenly thought he was holding a real gun. It was a realistic black airsoft gun. If this toy were more visibly harmless, perhaps he would still be alive.
Current law around imitation firearms is adequate. Painting all "toy guns" bright colors will only give the general public and police officers a false sense of safety — and hurt the imitation firearm industry.