Fishy, with all due respect, you have no frame of reference here, unless of course, you've driven every possible road in the San Diego area and just haven't told me yet.
1) Going slow keeps you at the intersection for 10 minutes (at a stop sign going to a main road), or you risk the chance of getting T-boned. When I had my Mustang, I had the torque to go slow over the bump and punch it when I was clear before I got hit. The Corolla doesn't make that power.
2) Gas taxes pay for road repair like potholes, freeway expansion, new roads, etc. Fixing all of the bumper killers would cost more money than the entire state takes in on the gas tax. You're talking the possibility of demolishing some buildings to level out the area and start fresh. Not exactly cheap when you figure in sewage, natural gas lines, water lines, etc. etc. etc.
3) Scrapes underneath the car doesn't bother me nor anyone here. Virtually every car in SoCal has them.
4) To further clarify, imagine a road 4 lanes wide (2 in each direction) and on one side of the road, you have a 30° slope to a 6' elevation drop into a strip mall. On the other side of the road, you have a 30° slope to an 8' elevation increase into an industrial park. That sums up the area by my work, and that is actually mild.