You, UNLESS THERE ARE CLEAR EVIDENCES THAT PROVE YOUR INNOCENCE, like there are in this case and there will be in such cases(like skid marks).

The fact that the trailing driver is USUALLY found at fault it is just philosophical razors applied to situations without enough evidences. Generalizing that into "trailing drivers are always at fault" is disingenuous, partisan and malicious.

Key word is "almost". Perhaps this is a situation where the fault is primarily with the overtaking car. However, an attentive driver should have started braking as soon as the illegal lane change was started.

You're describing the exception situation that has led to many drivers to install dashcams.