So let's look at this from a "probability" standpoint. Yes, the video of the Albert Almora emotions after hitting that 4 year old is tough to watch. But the knee jerk reaction to just extend netting immediately seems to be a little much.
First of all, how many people get serious injuries getting hit with foul balls. Now the key is "serious". A bump, or a sore spot doesn't count. You go to a baseball games, balls are hit into the stands, this happens everyday, every games since baseball was invented. There is a level of exposure when you walk into the stadium.
And before you go bonkers, look at the rest of our lives. We KNOW, beyond the shadow of a doubt that helmets prevent accidents and deaths of motorcycle riders. Yet helmets are not mandatory. The rider assumes a level of danger when they ride.
We know, KNOW, that slowing down the speed limit saves lives on the roads. This little girl, who seems to be doing ok now...had a better chance of a a serious injury or being killed going to a from the stadium in a car, than getting hit and injured by a foul ball. That's the percentages.