The left lane is not just for “speeders”, it’s for people driving faster than some people drive in the passing lane. There is such a thing as impeding the flow of traffic. More people should be ticketed for it. It causes accidents, congestion and global warming.
Another bad thing is slow passers, people who take forever to pass another car. In other words passing someone going 65 at about 66 or 67 MPH instead of getting it over quickly, courteously and safely.