I'm not being rude, I'm simply pointing out the fallacy of your argument regarding being rear ended by posting an actual event that happened to my best friend.
Maybe you should read it again...........
Maybe you should go take a nap. You’re cranky.
It doesn’t prevent being rear ended all the time but the bigger the gap you have the more time you have for the dipstick behind you to notice your brake lights.
Even if that is to no avail, the longer the gap space is, the more deceleration space you have so that you may get pushed into the vehicle in front of you at a lower rate of speed.