1. the rider did something stupid
2. the car driver 'didn't see' the motorcycle
Keep these two points in mind and do everything to can to minimize each one every time you ride and you will probably come out all right. The first point is obvious but you can actually control the second almost as much.
Visibility, visibility, visibility. Don't dress to look cool. Dress to stay alive. Wear a hi-viz jacket and a white helmet when you challenge the freeway traffic. A lot of drivers will think you are a cop; that is the one kind of motorcycle drivers are more likely to see for some reason.
Sportbikes and cruisers are more likely not to be seen because they show the least frontal area. Touring bikes with big fairings are easiest to see coming down the road. Standards like our GSs are somewhere in between. Sit as upright as you can to to fill as much of the driver's viewing frame as possible. It will be especially effective with that hi-viz jacket on.
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