Why were the citizens of herculaneum not prepared for the eruption of vesuvius?

The citizens of Herculaneum were unprepared for the eruption of Vesuvius in AD 79 due to a lack of historical precedent; the region had not experienced a significant volcanic eruption in recorded history. Additionally, many residents were unaware of the signs of impending danger, such as the earthquakes and gas emissions that preceded the eruption. The prevailing mindset at the time often downplayed the risks of living near a volcano, leading to complacency among the population. As a result, when Vesuvius erupted, the rapid and violent nature of the disaster caught them off guard.