On the other hand I want to point out what I heard from a family member of Reb Yakov. In the days when Rav Kahane was fighting for Soviet Jewry including violent protests and acts against the soviets someone asked Reb Yakov, "Don't we need to condemn what he is doing because he is violent?" Reb Yakov replied, "God forbid, what if what he is doing will succeed?" You don't know if it will help free the Jews or not. Better to say nothing about it so if it works, we have not discouraged his righteous efforts, and if it fails, no one can point a finger at us that we supported violence on US soil.
I paraphrased that but that was the gist of it.