Danag's comments can hardly have undermind the deterrent of the possibility of an Israeli attack on Iran, because no such deterrent exists. The best Israel could manage would be to damage the civillian nuclear infrastructure in an airial attack. The only people who actually think that Israel could 'do something' about Iran are right wing Israelis. Barak and Netanyahu do them no service by propagating a myth.
Poland's central bank head calls story of Nazi train find a hoax (Reuters)
from the article: Barak: Dagan's comments on Iran hurt Israel's ability of deterrence