This is the exact same phenomenon whereby the second place candidate in Dem primaries becomes very popular. the RW media pumps them up because it causes problems for the actual nominee. This is how Hillary Clinton became "the most popular politician in the country" in 2009!
Yeah, that was exactly the example I was going to cite. Demonized in the most incredible ways for thirty days, absolutely transformed into a murderous oozing eldritch horror ... but not continuously that whole time. Also treated generically or even generously when it served The Narrative.
In Chicago we call this the "backup quarterback syndrome." He's automatically the most popular athlete in town. If Caleb Williams throws a couple of picks in his first game it'll happen again.