<human>:  Why did the Romans kill so many people in the Antioch massacres?
<bot>: The Romans were trying to stop the spread of Christianity in the region. The Roman Empire was a huge empire, and it was very difficult to govern such a large territory. They needed to make sure that their empire stayed intact, and they were afraid that Christianity would weaken their empire. They believed that Christianity would lead to people turning away from the Roman gods and instead worshiping Jesus, who was not a god. So they believed that Christianity was a threat to their empire.