John Calvin Commentary Acts 17:8

"And they troubled the multitude and the rulers of the city, when they heard these things." — Acts 17:8 (ASV)

They raised the multitude. We see how unjustly the holy men were treated. Because no opportunity was granted them to defend themselves, it was an easy matter to oppress them, though they were guiltless. We also see that it is nothing new for magistrates to be carried away by the rage of the people as by a tempest, especially when the injury touches those who are strangers and unknown, from whom they expect no reward, because they will not put themselves in danger for nothing.

For then they disregard reason or equity and do not properly investigate the matter; one person incites another without any resistance, and everything is done chaotically, as when people rush to a great fire. But it happened, by the singular goodness of God, that such great heat was quickly calmed. For as soon as the magistrates announce they will look into the matter further, the multitude is appeased. Security is provided, and eventually, the matter is concluded.