A driver that drives unreasonably more slowly than the traffic that surrounds them is a bad driver. They cause traffic and create more chances for crashes -- after all, crash severity is directly proportional to relative speed between moving bodies.
People seem oblivious to the reality that vain platitudes will never convince aggressive drivers to drive more safely in traffic.
Police are guaranteed to obsess over speed. It's just like the war on drugs: officers can measure and record criminal behavior! Easy money. Not once in my life have I even heard of the other law that is posted on signs - slower traffic keep right - being enforced.
Traffic flow is as important as any other variable in this system. Crash intensity is zero when there is no collision.
There is you, and the slow driver blocking traffic in the passing lane next to you.
Then there are the 8 cars behind you, and at least one of those drivers is making everyone unsafe out of frustration.
You can't do anything to change that driver's behavior. The situation persists until the system is altered.
Bottling up traffic is not safer! Every driver in a line who has to slam on their brakes, for whatever reason, subtracts the amount of available reaction time left to the driver behind them.
What makes more sense is leaning on the raison d'etre of multi-lane highways: slower traffic keep right. Designed systems work best when used as designed.