Riding fixed gear is like driving without brake lights

Probably not a good idea to start hypothesizing over possible blame apportioning based on pedalling mechanics in the context of non-cyclist perception. There are already enough things that unscrupulous lawyers and deluded judges have in their 'it was the cyclist's fault' arsenal.

I agree with this. That's why I made a point of saying that it is always the rear-ender's fault.

And yoav is surely right about the typical car driver's bad judgement. I think you're more likely to be rear-ended by another cyclist who's following you more closely than they should than by a car driver who's probably positioned to the side of you.