A careful reading of Acts 19 will show that the "riotous mob" was actually under the control of some and acted with purpose. There is a very specific reason that the word used was ekklesia and not homilos as was used to describe riotous crowds throughout the rest of the Gospels.
Peace and Blessings
That is your "careful reading"?
28 When they heard this and were filled with rage, they began crying out, saying, “Great is [r]Artemis of the Ephesians!” 29 The city was filled with the CONFUSION, and they rushed [s]with one accord into the theater, dragging along Gaius and Aristarchus, Paul’s traveling companions from Macedonia. 30 And when Paul wanted to go into the [t]assembly (people), the disciples would not let him. 31 Also some of the [u]Asiarchs who were friends of his sent to him and repeatedly urged him not to [v]venture into the theater. 32 So then, some were shouting ONE THING and some ANOTHER, for the [w]ASSEMBLY (ekklasia) was in CONFUSION and the majority did not know [x]for WHAT REASON they had come together."
Sounds like Rome to me...