Mammele,
1. So write a letter to the Kushners. According to your opinion there is no issur of LH as all of our actions affect all of us. By publicly condemning them (and I reiterate that as you are relying on news reports which may not be fully accurate you are at least over on kabbalat LH) you are arrogating to yourself the role of posek. Do you have a license to pasken? Do you know all of the details?
2. Regarding those Jews who worked on Shabbat in America, they have already been judged by the one True Judge.
3 Rabbi B obviously had no halachic answer (if this anecdote really happened – I personally take these stories with a metric ton of salt). Would he say that to a woman who is in labor? Would he even say that to someone who wants to know if he can drink soup that was reheated on Shabbat, which Rambam , Rashba, and Ran allow (see Mishna Berura 318:2)? I am underwhelmed by your story.