All classified information is not created equal. Some information is classified because of the danger it might cause if enemies or potential enemies were to access it. Other information is classified to cover the ass of some government functionary. The information classified to conceal the fact that the IDF has an assassination program is of the second type.
Aden hotel used by Yemen goverment hit by grenade (Reuters)
from the article: As a democracy, how can Israel censor citizens' right to know?