They're common in landscaping throughout the US. We had some in our front yard, but us kids knew better than to eat random berries. It's painful for me to think that there are people out there without the common sense not to eat random plants they don't recognize.
Folks visiting the desert and distractedly running straight into octillos is just good entertainment. There's not much on the east coast that prepares you for a random shrub to be so hostile. Poisonous berries though, they're everywhere. I'm surprised your fellows made it to adulthood without basic suburban survival skills.
Except for grass and most trees, suburban foliage is often quite toxic. A lot of your ornamental plants are poisonous. Think lilies, foxglove, Solomon's seal, and all the excitement of morning glories. The basic understanding that you don't eat anything you can't identify as edible is important in the suburbs too.
I don't disagree, but I'd say there's not really a big problem with people or kids trying to eat flowers. Foxglove and solomon's seal are dangerous but they also don't grow where I'm at. Lilies and morning glory do grow here, and they are also not terribly dangerous to humans (without eating a lot of them.)
Where I'm at, particularly in the suburbs, there's a distinct lack of things that are tempting to eat (like a berry) and also poisonous.
Folks visiting the desert and distractedly running straight into octillos is just good entertainment. There's not much on the east coast that prepares you for a random shrub to be so hostile. Poisonous berries though, they're everywhere. I'm surprised your fellows made it to adulthood without basic suburban survival skills.