It's the mysterious side of Roman culture. Also, the language itself is an isolate and of linguistic interest as language isolates are unusual in Europe.
Probably because their territories were conquered by the early Romans and little remained of their history after the Romans overtook those areas... And Romans are seen, along with the non-conquering Greeks, as _the_ pillars of Western Civilization.
It is more accurate to say that Roman culture is a blend of Latin, Etruscan, and (later) Hellenistic culture. The Romans may have finished them off, but not before appropriating massive amounts of culture: the household shrine, burial rites, and the fasces to name a few examples.
Fun fact that might pique one's interest: the fasces, which is still widely used to symbolize strength through unity, is believed to be of Etruscan origin.