I was taught to keep distance between yourself and the vehicle in front of you in the case where that vehicle might stop suddenly, you will have sufficient room to stop as well. I was not taught that this "cushion" is also gratuitously available for somebody in a hurry who cuts over without a signal, effectively cutting my cushion into a fraction of what it was before, as now I have to consider/recalculate the distance between the cutter and the vehicle I was following as well as the distance between myself and the cutter - in fractions of a second.
When the cutter who swerves in with no signal suddenly has to stop because the vehicle ahead stopped suddenly - and can do it (being smaller and lighter), but now that my stopping distance has effectively been halved at the very least, I cannot stop, in traffic, I cannot swerve, and there is no place for me to go - so how again is that my fault? After some research, I just ordered an actual dashcam that is designed for capturing these events.
I fail to understand how anybody can argue that the cushion you provide for your own safety is actually an invitation for another to move into that space. Sounds like cutters just trying to justify their obnoxious behavior.