There's a near-exact correlation with the rise of smartphone use in the US. Anecdotally, I've almost been hit more often in recent years here in NYC and it's almost always due to absolute morons staring at their cell phone while behind the wheel.
If you think pedestrians "jaywalking" is the problem, you are the problem.
It's now 2019. We're smarter. We know how to engineer streets to not embarrass ourselves further with meaningless "appeals to everyone to watch out".
Can you provide a example of these 'engineered streets' that you are talking about? I truly don't what you mean here.
Anecdotally, cars in Europe on average also seem smaller than those in the US, and maybe a similar correlation for vehicle-pedestrian accidents exists but simply don't result as often in fatalities.