I've been forwarded an article on a possible boycott of the Agudah's Siyum haShas by the Vizhnitzer Rebbe. The article begins,
According to a Kikar Shabbat report, the Vishnitzer Rebbe from Monsey Shlita may boycott the main Siyum HaShas because “Zionist rabbis” are expected to address the tzibur. This apparently may also lead to other prominent rabbonim and admorim shlita to boycott the event.
Those who have forwarded this to me contend it is an example of sinat chinam, the baseless hatred which one gemara (Yoma 9b) says led to the destruction of the second Beis haMikdash and our current, long-running exile.
I'm not sold, though. Why is he not entitled to take a strong stance? Of course I disagree - I am one of those "Zionist rabbis" whose presence he would oppose - but why is he not entitled to decline to participate, if he feels that participation would endorse my stances? It's not as though he is coming out with guns blazing, on the offensive, looking for trouble.
Update: To clarify-
Ezra refused to build the second Beis haMikdash along with the Samaritans, because he believed they wanted to use it to further their anti-Torah cause.
The Rambam, Rav Eliyahu Mizrachi, the Radvaz and others prohibited teaching Torah to Karaites, believing that they wanted to use it to further their anti-Torah cause.
As Pirkei Avos 1:7 says, one may not join with "a wicked person".
We would not celebrate Torah with Jews for J missionaries, for the same reason.
If he truly believes that we are opposed to authentic Judaism, and that we are spreading that opposition beneath the disguise of supporting Torah, why would he join with us?