Italians probably go out and about more than most other Europeans during the weekend
Italians have a different understanding of personal space than most other Europeans
Northern-Italy is a hotspot for tourism (take Venice & Milan i.e.) so it'll see a lot of traffic and therefore increased risk
Northern-Italy is also the place to be to for any substantial Italian company, so it'll likely see more visitors from abroad in a smaller region compared to other countries
Italy is probably more strict / has started earlier in checking inhabitants and visitors
Not to be neglected, Italians are great in overreacting to a situation as well
They do also like pizza but that was less important to mention.
Other than the personal space which should clearly be taken with a pinch of salt (but nevertheless true), there's not much cultural stereotyping going on. It's simply what I notice compared to living in another European country.
There could be a couple;