The attacks are attributed to Iran because the Iraqi militias that launched them are IRGC assets, in the same way that no security agency anywhere in the western would refer to Hezbollah as "a Lebanese militia". The chatter in mideast analyst Twitter (representative sample: Rasha Al Aqeedi, Oz Katerji, Nadwa Dawsari) mostly seems to be people dunking on Iran for trying to claim it wasn't behind the attack.
The sense I get is that this is looked at somewhat as Avon Barksdale had given all his crews orders to shoot any members of the Stansfield Organization on sight, and, after a bunch of bloody shootings, tried to claim "oh, I didn't order any of those attacks specifically". That argument wouldn't hold up in court, where the standard of evidence is relatively high; it definitely doesn't stand up in the court of USCENTCOM, where the standard of evidence is probably mostly vibes.
The sense I get is that this is looked at somewhat as Avon Barksdale had given all his crews orders to shoot any members of the Stansfield Organization on sight, and, after a bunch of bloody shootings, tried to claim "oh, I didn't order any of those attacks specifically". That argument wouldn't hold up in court, where the standard of evidence is relatively high; it definitely doesn't stand up in the court of USCENTCOM, where the standard of evidence is probably mostly vibes.