Israel's fault.
From the report:
"Several Iraqi, U.S., and international officials commented to us that Iraqi opposition to the United States—and support for Sadr— spiked in the aftermath of Israel’s bombing campaign in Lebanon."
No mention of why Israel was bombing Lebanon.
They actually say that some people "mentioned" to them that some Iraqi opposition "spiked" when Israel was fighting in Lebanon??? What the hell does that even mean? Not much.