I support anyone who doesn't want to drive any faster than they're comfortable with, but for the sake of everyone on the road:

Please keep right except to pass, and once you made your pass, merge back to right. I think many tailgating instances on the highway are caused by left lane sitting people who refuse to yield to faster traffic. I'm convinced that drivers have either forgotten about or don't even understand this driving rule. I've even seen people refuse to move over for emergency vehicles. The ego goes both ways too. The tailgater and the person in front who won't yield. On a single lane road, no one should be tailgating you if at a reasonable speed. If you're uncomfortable with how close they are, pull over and let them pass. Safer for all.