When you overtake another vehicle at right why should you use your low beam?

Common Sense....just put yourself in the driver's seat of the vehicle that you're overtaking...you're driving along the highway at 100km/hour and a car tries to overtake you with high beam...what do you think happens...disaster....You're only to use your high beam if there's no vehicle in front of you or on the opposite side of the road or more than 200 metres in front of you...but I prefer to use my high beam if there is not a single vehicle in front of me.