If you've been here that long, you'd know that the limit drops to 30 over the bridge for a reason, only to ramp back up to 50 ~200m later. I know this it's hard to wrap your head around, but some people would rather not accelerate back to 50 instantaneously, some people are old, cautious, nervous, and others yet are still learning how to drive.
I know, I know, I've driven that 6.7L turbo too! They certainly like to go forward. But you'll get to your destination ~15 seconds later, the earth will continue to revolve around the Sun, and life will go on. It'll probably be more fruitful to concentrate on that latter point, rather than trying to change people's long-ingrained driving habits.
If you want to focus your energy on improving other's experiences on the roads, you should concentrate on something that's actually meaningful. For example - bad highway driving which is: a) far more widespread, and b) far more dangerous.