Highway safety isn't just about the vehicle on the road. Highway safety is a complex interaction of human, machine and (occasionally) the stray wildlife that might inadvertently cross our path. Any or all of these elements may behave less than ideally on the highway. That's a guarantee.
Because we know it will happen, we are all obligated to look out for whatever might go wrong. Expect the "unexpected." Drivers might be distracted, confused or just plain stupid. Pedestrians abound in life, and they aren't always paying attention. Vehicles fall victim to breakdowns, fuel shortages or disrepair. Wildlife - well, there's just no accounting for the stray deer, aardvark or moose that might decide to cross into your path at a poorly determined moment.
Don't blame the other guy. Take responsibility for yourself and for the potential lapses that may occur around you. The more you do to avoid the next accident or road rage incident, the more user friendly the road will be.