They pretty much did, yes;
One July 3rd a US Presidential statement stated; The course of the Iranian civilian airliner was such that it was headed directly for the U.S.S. Vincennes, which was at the time engaged with five Iranian Boghammar boats that had attacked our forces.
(Of course, since the plane was climbing, it wasn't headed directly for the Vincennes, and the Iranian boats that "attacked our forces" could only fire upon a US helicopter because the helicopter had broken the rules of engagement and flown too close to the Iranians - something the helicopter pilot admitted in testimony).
Another statement on July 11, 1988 read; The responsibility for this tragic incident, and for the deaths of hundreds of thousands of other innocent victims as a result of the Iran-Iraq war, lies with those who refuse to end the conflict. A particularly heavy burden of responsibility rests with the Government of Iran, which has refused for almost a year to accept and implement Security Council Resolution 598 while it continues unprovoked attacks on innocent neutral shipping and crews in the international waters of the Gulf.
So, yes, that would be placing a huge amount of blame on Iran for the incident.
Can't argue with facts.
The US claimed the "self defence" angle but that is bull, you have to be under attack before you can use "self defence", and it was the US who over-stepped the mark to draw fire in the first instance.