It looks to me like that is ALL child/cart injuries, not just babies in infant car seats falling?
A kid hanging on the side of an empty or nearly empty cart will cause it to fall. Kids can stand up in the seat and fall. Etc. I agree there are a LOT of ways kids can be injured by shopping carts. Also a lot of parents will take their kid to the ER over any minor head bump so a huge number of those thousands of cases might not even be noteworthy. Treated does not mean something was actually wrong - it can just mean evaluated and released.
I feel like the risk of putting the bucket in the seat has been greatly hyped up and turned into a mommy war shaming point where people have lost the ability to think critically.
What are the risks?
1. The cart might tip over
2. The bucket might fall off
With regard to the cart tipping over, MOST carts in this day and age are heavy enough that putting a baby bucket centered in the seat is not going to create a tipping hazard. Can it happen? Yes. But usually it does not. Common sense should determine whether or not putting the bucket in the cart makes it top heavy - those tiny carts like at trader joes or drug stores absolutely should not have buckets placed in the seats (quite frankly I think they feel unstable even with kids sitting in the seats as intended)
With regard to the bucket falling off, I swear the old Graco buckets snapped in there like they were made to fit. I don't know if it was by design or by chance but the buckets evolved to where they no longer snap in. Were car seat makers trying to discourage the practice? Possibly. And carts have changed as well - some have really deep seats now, some have a hump that I suspect was placed there to keep you from putting the bucket there - but people still do it, and trying to make something NOT work that people are going to still do has probably led to an increase in injury rather than a decrease in use. I have seen buckets perched up high, sideways, to make it work and to me this is much more dangerous than a centered, secured bucket.
I have never seen people argue that travel systems are unsafe because they make the stroller top heavy and the stroller might tip - but it's really not that different in concept. The difference it that the two are designed to work together. There are cart and bucket combinations that do work together - it is becoming increasingly uncommon but back in the day if you stuck a basic graco bucket on your average grocery cart, I swear it felt absolutely stable. (Yep - I am a former bucket-on-cart putter onner and I never once felt my kids were unsafe, it's not because I didn't think but because I DID think. Does this particular situation feel solid and stable to me? If it did not, I didn't do it. Once I moved up to the snugride35 I did find the cart/seat combo didn't work so well. And I have done more than my share of baby wearing and stroller pushing and I still say putting the bucket in a seat is a very handy option to have)
I've never been able to get worked up about the bucket in the seat thing because I do not feel that it is inherantly unsafe, although I agree it IS unsafe in some situations. So why not design a system that is made to work in the majority of cases? Take a heavy, stable cart, and provide a properly centered dock that will securely hold the bucket. People don't put the bucket in the cart seat because they are stupid, they do it because it makes shopping with a baby a lot easier. Maybe you don't want to wake a sleeping baby, maybe your baby doesn't like to be worn, maybe you left your ergo at home, maybe you don't want the whole back of the car filled up with baby bucket so there is no room for groceries. Maybe you like the face to face contact with your baby that is far enough to really "talk" and admire each other vs. on top of each other like with baby wearing - why else are parent-facing strollers so popular? People do it every day in every store in the country and in MOST cases no harm comes of it.
Rather than offer safe "solutions" that aren't as easy for whatever reason, why not work on a way make it safer?
I think it looks like a really good idea.