No, many heeded the warning signs and got out. Mount Vesuvius did not just suddenly erupt. For weeks before there were earth tremors and the water supply was drying up. The smart ones left well before the destruction occurred. Remember too, that the area around Vesuvius with the exception of Pompeii, was a resort area and many of the villas were only occupied part-time. In the town of Pompeii itself there are surprising few casualties compared with the estimated population of the town, proving that many more escaped than were killed.