So gefen, what you’re saying is that Hashem will, at times, prevent us from implementing our own free choice, and that we should take a leap of faith and always presume that “it’s for the best”. Like Rabbi Abuchatzeira’s stabbing to death was from Hashem, and not entirely the free choice of the murderer to do so.
If I hold a gun capable of shooting down 100 Jews, are you going to tell me that if I (chas v’shalom) would do so, that I would have been controlled or guided by Hashem to do so, and that clearly all the victims “deserved” death? I think it is clear that man can make a choice that could have terrible consequences on someone else, and Hashem will not (necessarily) intervene.