The US had trusted Korea and didn't intercept PU shipments. The material could have been used against the US as well. Then the US opposed any Israeli strike and needed convincing and waiting for an "evidence is shown" Iran is another case where the US can't be trusted to save Iserael or even herself for that matter. Talk,talk,talk-until it's too late.
Knesset passes 'Norwegian Law' allowing ministers to resign their seats, remain in cabinet (Haaretz)
from the article: Inside Intel / Not a reactor - something far more vicious