It isn't as black and white as you make it out to be. I have a dashcam, if someone cuts me off and slams on their brakes I may not have time to react. The part

It isn't as black and white as you make it out to be. I have a dashcam, if someone cuts me off and slams on their brakes I may not have time to react. The party in front could be responsible if you can prove it with a video. The insurance company WILL CARE if you have footage. However, if someone seems to brake no reason, it is on the driver behind to stop.