"In addition to delivering the sentence on the nuclear scientist, they were sending a message to the authorities in Tehran." Not only that. The message is also that it is acceptable to deal in such a way with problems in the country of one's enemy. Human life is cheap. The US and Israel have many enemies too. Approval of acts of terrorism and assassination 'in some cases' is a dangerous game that could have a nasty backlash. The message is that it is ok to have blood on one's hands if there is a point to be made. Rather sad, I think.
Shaffir to Herzog: Opposition failed to show leadership in political battles against PM (Haaretz)
from the article: Assassins of nuclear scientists are sending a double message to Iran