Because this wasn't random. It was done to make a point about the hypocrisy of preaching the teachings of the Bible while literally terrorizing the people of the same city your church is in.
Can it with your pearl clutching bullshit. The people in the service were slightly inconvenienced because of people yelling at the service.
Meanwhile, you and the other cultists here are literally defending the actions of a completely unaccountable, masked, untrained, paramilitary force, terrorizing the people of this city on a daily basis.
Murder, beatings, abducting US citizens, asking random people on the street for their "papers", and arresting them if they refuse, tear gassing a car full of kids? You're good with all that.
But protesters interrupting a church service where one of the head goons preaches?
Fuck you.