shouting, “Fellow Israelites, help us! This is the man who teaches everyone everywhere against our people and our law and this place. And besides, he has brought Greeks into the temple and defiled this holy place.” (They had previously seen Trophimus the Ephesian in the city with Paul and assumed that Paul had brought him into the temple.)
Acts 21:28-29

When we make assumptions by what we see, we can easily cause unfounded discord and create divisiveness.