I am not going to comment at this point on my view regarding this demonstration. I only want to record here the circus that is being put on by those claiming to report on what "Da'as Torah" is on this issue.
Letter #1 allegedly from Rav Chaim Kanievsky, שליט"א - one should not attend the demonstration
Letter #2 allegedly from Rav Chaim Kanievsky, שליט"א - one should attend the demonstration
Letter from Rav Shmuel Kaminetsky שליט"א - one should not attend the demonstration
Letter from Rav Dovid Soloveichik שליט"א - one should attend the demonstration
Letter from the combined Lakewood Roshei Yeshiva שליט"א - one should not attend the demonstration
Letter from Rav Eliyahu Ber Wachtfogel שליט"א - one should attend the demonstration
I also note for the record that I was in Yeshivas Chaim Berlin on Thursday, and there was a sign posted on the door in the name of the Hanhalah encouraging the talmidim to attend.
What is a person who is serious about Da'as Torah to do? I don't know. Other than to pray hard:
השיבה שופטינו כבראשונה, ויועצנו כבתחילה, והסר ממנו
יגון ואנחה, ומלוך עלינו אתה יי לבדך בחסד וברחמים וצדקינו בצדק ובמשפט
Restore our judges as in former times, and our counsellors as of yore; remove from us sorrow and sighing, and reign over us, You alone, O L-rd, with kindness and compassion, with righteousness and justice
PS - A statement from the Rabbinical Council of America, which I think is a bit over the top as the demonstration is not about support for Israel but rather the new government attitude to the Hareidi community, but nevertheless: