Simply put; Trump supporters are stupid. They were played by the Russians or they would have otherwise voted for Hillary.
This so-called conclusive report paints Hillary as a victim and implying that the emails depicting the way the DNC and her campaign behaved were manufactured in order to denigrate her. Uh?
Then there's this;
The bombshell document details the IC’s findings, but provides little in the way of forensic evidence backing up its assessment, citing the need to protect sources and methods.
“While the conclusions in the report are all reflected in the classified assessment, the declassified report does not and cannot include the full supporting information, including specific intelligence and sources and methods,” the report reads.
Simply put the report offers "nothing" to support it's conclusions other than the opinions of those who wrote it.
Now, that does imply that Americans are stupid.
Declassified report says Putin ‘ordered’ effort to undermine faith in U.S. election and help Trump - The Washington Post