Say you're driving down the road, minding your business and all of the sudden some air-head jogger wearing headphones bolts out of nowhere in front of your car.
What's the first thing you're going to do? You're going to stand on your brakes and hope the driver behind you does the same. But he probably didn't see the jogger and now you've been rear-ended. Hope your neck's ok.
Now you're probably thinking of some of these "really old laws" and wishing they were being enforced.
Argue for jaywalking laws all you want, but let's be clear here. This jogger didn't bolt out of nowhere in front of a car.