Why ancient Romans and Italians were so good at warfare, and modern Italians are not

[Corvus]

I was always asking myself the questions, why ancient Romans and Italians were so good at warfare and also disciplined and stoic, but modern Italians are not?
Of course the question is also are modern Italians descendants of Romans, Etruscans, Samnites.
It seems the roman mentality was different to the typical Mediterranean mentality.