Never discount the possibility that many of those darker colored cars that had accidents were being driven without lights. Almost every time that I drive at night, I see some vehicles being driven without lights.
And, during the daytime, despite the fact that state law in my state and adjoining states mandates the use of headlights when driving in the rain, I frequently see vehicles being driven without lights while it is raining. While the vast majority of these un-illuminated vehicles are SUVs and pickup trucks, it is obvious that a dark color car that is driven without lights–whether in daytime rain conditions or at night–will be harder to see.
Just be sure to drive with your lights on, and you should not wind up as a statistic.