People want to shift blame. The influence and money between the US and Israel is a revolving door. The US gives Israel tons of money in defense and security contracts, orgs like AIPAC redistribute some of those funds back to the US to keep the revolving door greased.

I think it's incorrect to say Israel is pulling the strings when admins of both have been colluding almost since Israel's existence.

People are saying this now because Benjamin Netanyahu has vocally and persistently been trying to get into a full scale war with Iran for 40 years. The Trump Administration is the first administration corrupt, gullible, dumb enough to agree and commit. All other U.S. Admins have primarily postured or done limited retaliation based engagements with Iran or engaged in soft power activities and got comprehensive deals.