I find Europeans are super paranoid as someone who lived there.
Really? Do tell what city/country. No street address required.
In many parts of Europe (not all) I would describe the opposite phenomenon.
In Oslo and in Copenhagen, I've seen parents leave their stroller, with a sleeping child in it, outside a store or cafe while they go inside for a few minutes. This is considered socially acceptable, while not everyone does it, for sure, its not 'abnormal' either.
That certainly doesn't strike me as paranoid; no one views this behavior as negligent or unreasonably risky, they didn't want to risk waking the child, futzing w/getting a stroller through a door, or removing the child from the stroller. If you ask 'but what if a stranger harms or takes your child? You will get a very strange, and consternated look, and if they're still talking you after, they'll note that kidnapping babies/toddlers is not a thing in their country, and who harms a stranger's young child in a stroller? Of course, the risk is not zero of such things, even there, but is remote, and so its not seen as something to be paranoid about.
Now, that is not considered acceptable/normal in all of Europe; and you shouldn't expect to see that happen in London, in my experience.
I don't know if I can think of a European country I've been to, and I've been to many where I would describe paranoia as a widespread state of being.
Certainly, in Rome, people are a bit more conscious of their wallets on the subways, where pick-pocketing is an art form.....
But that's more reasonable than paranoid.