For reference, http://dfw.cbslocal.com/2015/10/20/driv ... cle-crash/
A couple out on a motorcycle, riding too aggressively, get attacked by a motorist in a car. If I understand the situation correctly, the car driver, going a little slow and starting to pile up traffic, hits the "boring" button on a sport motorcyclist who passes in a no passing zone. It looks like he had visibility to pass, considering his acceleration and the slower speed of the two cars he was passing, but he was out of line. He shouldn't have tried to pass there.
Which didn't give the slow driver any right to nail the guy, sending his girlfriend into surgery.
There's obviously some blame on the part of the motorcycle pilot. He passed illegally. But more to the point from an armed citizen perspective, it's probably a really wise idea not to be an irritant. It's also true the car driver crossed the same yellow stripes the motorcyclist did. Pot and kettle, perhaps a case of homochromatic cookery, but with overzealous fun answered by calamitous intent.
Keep calm, carry, maintain situational awareness and the skills to answer deadly threat with precision, and keep a smile on your face if there's not a reason otherwise. Grin and be sociable, if for no other purpose than to confound your detractors and confuse your enemies.

My takeaway - I shouldn't be a jerk, someone could put my girlfriend in a hospital, and she's the only one for me these past 30 years.
Don't overreact for the obvious moral reasons, not to mention the legal entanglements.