Zeal can be motivated by righteousness and by unrighteousness. The Jews in Jerusalem had heard about Paul and thought the worst of him. They thought he was a traitor to Judaism who sought to turn everyone away from the faith. Seeing him in the temple and assuming he had brought his Greek friend in, they formed a lynch mob and tried to kill him. They were whole heatedly devoted to their people, law, and temple. Anyone who posed a threat to any of those was worry of death.
Of course Paul was not anti Jewish or opposed to the law or temple, but they didn’t take the time to ask questions.
Do you see this impulsive behavior in our world today? In politics, education, or religion?