Even though Eliyahu the prophet {Elijah} is well known for the events at Mount Carmel, still the subsequent events are less well known. The events were thus: Israel were worshiping the Lord along with the idolatry called the Baal. The Baal was considered in control of the Earth,- and the Lord in charge of events in heaven.
Elijah asked Israel to make up their minds, and set up a test. The priests of the Baal would make an altar and bring sacrifices. Elijah also would make an altar; and the god that would answer will show that he is the true God. The Lord answered Elijah in fire. Then Elijah said, "Grab the priests of the Baal and kill them." And that is what happened. Elijah did not excel in tolerance. He does not seem to have held from religious freedom either.
The unique thing is that Israel listened to him. They killed the priests of the Baal.
Later Elijah from Vilna [Gra] tried to do the same thing. But he was not listened to. That was the whole point of the letter of excommunication that he put his signature on.
But in fact, even Elijah the prophet did not have much great success either. From Ahab until the actual exile of Israel [for the sin of idolatry] was not that long.
I should mention that Yehu, the king, also killed the priests of the Baal at a later date. In other words, in terms of legal issues, he felt that priests of the Baal did not need עדים והתראה (two witnesses and a warning). He probably depended on אנן סהדי "we testify." That is,-- once something is well established publicly, then the courts consider it to be known by witnesses.
[I mean to say that normally you need עדים והתראה witnesses and a court of 23 judges. So it is interesting why both Elijah and Yehu did not feel the need to stand on legal minutiae. ]
What I mean to say that even though Litvak yeshivas generally go by the Gra in most points, still in this crucial issue, the Gra is totally ignored--as if we know better!
The repercussions of ignoring the Gra are as vast and and harmful as ignoring the warning of Elijah the prophet. Yet just as then Israel said, "Yes" to Elijah and then just went straight back to doing what they were doing beforehand. So it is with the Gra. And there is no question that unless people wake up, the results will be the same.