בס''ד
There is something that has bothered me for a long time: We have some members who are under the impression that we are forbidden to curse even self-hating Jewish traitors because they are "our fellow Jews".
Not only are we obligated to curse them, we are actually obligated to kill them. But we in JTF are so moderate and so law-abiding that we do not kill these traitors even though under Torah law, that is our obligation. We JTFers are simply too moderate and too law-abiding to do such a thing.
But Moshe Rabeinu (Moses) was not too moderate to do what the Torah commands. He ordered the Leviim to kill 3000 golden calf worshippers in the Sinai. The Leviim took their swords out and killed every one of them.
And Pinchas was not too moderate to do what the Torah commands. He killed Zimri who was Nasi Beit Av (President of the Rabbinic Court) for the tribe of Shimon. And Pinchas acted without authorization from Moshe or the other rabbinic authorities. Why did Pinchas kill Zimri? Because Zimri had a relationship with a woman from an enemy nation. Until Pinchas the vigilante acted, tens of thousands of Hebrews were killed in the desert by a plague that Hashem initiated to punish them for tolerating Zimri's relationship. But as soon as Pinchas the zealot killed Zimri and his girlfriend, the plague ended. Hashem praised Pinchas in the Torah ("he was zealous for My name's sake") and promised that Pinchas' seed would be the priests of the Holy Temple forever because of this blessed deed. In other words, Pinchas killed "his fellow Jew" and was eternally blessed by Hashem Himself.
And Moshe again sought to kill "his fellow Jews" when Korach and his congregation disputed Moshe's leadership. Moshe prayed to Hashem for the earth to swallow up Korach and his followers. Which is exactly what happened - Hashem granted Moshe's curse and killed every one of Korach's followers.
And the Macabees started their revolt by killing "their fellow Jews" - thousands of mityavnim (Hellenists) were slaughtered by the Macabees. After this slaughter of Jewish traitors, Hashem granted the Macabees the miracle of the Chanukah oil as a sign that what the Macabees had done and were continuing to do was indeed G-d's will.
Chazal (the Talmudic rabbinic authorities that we are required to follow) instituted the prayer against Jewish malshinim (informers) that we must repeat three times a day. That prayer calls for the violent death of Jewish traitors, and curses Jewish traitors with the ultimate curses.
Now it is true that we cannot curse our fellow Jews who are merely mistaken or wrong or who are sinning bishgaga (unintentionally or out of ignorance). But Jews who seek to harm their own people bezadon (intentionally), or who support their people's enemies, or who endanger Jewish lives (rodfim) - these Jews are supposed to be cursed, and are supposed to be killed. We JTFers happen to be too moderate to do this, but this is Torah law.
I also know that some of our members have unintentionally engaged in cursing where it is forbidden. It is absolutely forbidden to curse Torah scholars, for example, even if the Torah scholars are mistaken. It is also forbidden to curse Jews unless they have clearly crossed the line of treason.
But once Jews have crossed the line of treason, not to curse them is a terrible sin. Six million Jews were murdered in the holocaust because we tolerated traitor Jewish leaders. And to this day, Jewish traitors in politics, the news media, Hollywood, the business world are unafraid to openly stab their own people in the back. They know that they have nothing to fear. This is why little Israel is in so much danger, this is why American Jews have mostly disappeared through assimilation, and this is why we lost millions of Soviet Jews who assimilated and are no longer Jewish. Until Jewish traitors fear for their lives, the Jewish people will always face grave perils.