And you've never been to a WalMart or Target if you think that something like Lidl is remotely comparable. Offhand, I'd say that the American versions of those stores are anywhere from 3-20x larger, and I'm not at all exaggerating.
Walmart is more like a bunch of stores. You can buy car tires, clothing, food, a playstation, vitamins, diapers, curtains, house paint, alcohol, tobacco, a gun, a coffee pot, a mop and a sewing machine in one stop.
Now, I understand that I'm in Norway, an immigrant, and haven't been all over europe, but I've not seen such a place that sells such a variety under one roof and one brand name.
And about the crime rates: Malls in the US started their downturn years ago. It wasn't the crime rate - I suspect it is just the assortment of stores and location and the increase in online shopping. Unlike here, I'm not usually going to find a grocery store in a US mall - traditionally, they didn't tend to sell practical items at malls. It generally isn't going to be convenient. And ordering online probably is cheaper, considering the travel time and stuff.
While they may not exist in the US, I think Aldi does have 'hypermarkets' (ie Walmart-type things) in some countries. Other brands certainly do, and would cover most of that stuff (though, well, not guns).
That hypermarket (not Carrefour, another one) it's composed of several buildings, they even have a renewed VR arcade gaming place and several cinema rooms.
You can buy books, computers, clothes, groceries, tyres, courtains, tools, whatever.
On Wallmarts and such, don't make me laugh. Ever heard of Carrefour? Lidl/Aldi? Eroski? Mercadona? Just a few names in Spain. Big hypermarkets outside the town/city.
We also have American shaped malls, too, but they are often placed in the middle of a city.