It depends what type of racing they are doing. In a Time trial there are specific Aero helmets that many prefer. In touring a long distance road riding a light comfort helmet is preferred it's very dependent and also has to do with preference.
Because they have a death wish. Always wear a helmet. ALWAYS.
Kind of a loaded question for many but yes they should
Professional baseball teams only wear helmets when batting and they don't have designated colors. Several baseball players wear red helmets when batting.
all motorcyclists wear helmets, squids don't wear helmets.
Sikhs do not have to wear crash helmets as part of there religion.
Mostly vert pro skaters wear the helmets.
Not all builders wear yellow helmets, but builders generally wear brightly colored helmets...brightly colored to maximize their visibility at the work site, and helmets to protect their heads from injury.
Players wear helmets when playing American soccer.
Different helmets
spacemen wear helmets because , there is no oxygen in space. They have to carry an oxygen cylinder on their backs.
Skateboarders don't usually wear helmets unless skating a vert ramp
Yes, It is important to wear a helmets in your rides. Helmets can protects you from any accident.