Actually, the man convicted of killing Prime Minster Rabin was raised in a Tel Aviv suburb -- I don't remember the one; perhaps it is the same one that today's shooter came from. I agree with you that he was not a lone psychotic gunman, but from what I've read he was a tool of Israel's intelligence agency, which placed an agent in the West Bank to provoke Jews to take extremist positions.
Shooting the Prime Minister was a terrible crime, but it was not based on his learning in Israel's "far-right" religious institutions. Rather, it was based on the teachings of the provacateur, who invented secret initiation ceremonies, passed out leaflets describing the Prime Minister as a Nazi, and took other inflammatory actions that made this psycho believe that he was part of a larger movement.
What is more, after the shooting of Prime Minister Rabin, Netanyahu's lead in the election nearly evaporated, and he managed to just squeak by Shimon Peres to become Prime Minister. Very often, political assassinations have the opposite effect of what is intended because they mobilize the opposition.
I am glad that you at least agree that the assassination of Prime Minister Rabin was not a good thing. Now, what about the praise for the ultra-Orthodox religious zealot, Yigal Amir, from many in Israel in the United States?