I haven't seen actual figures, and it would be difficult to measure, but I have a distinct impression that most trucks in the suburban area I live are used to commute to work, not haul anything. Around here, they're status symbols, not work vehicles.
Also, in case of accident, the amount of steel in those trucks protects their drivers by increasing the lethality to other vehicles. So, I don't entirely not worry about large trucks driving around me.
And then there's fuel efficiency. Other people's bills at the fuel pump is not my business, sure. But then, there's a pretty solid scientific consensus that man made climate change is on course to have a drastic effect on living conditions on this planet. But I concede that you're free not to believe in the scientific method if you don't want to.
So focus on yourself, but do pay attention to others.