Just about the only people that agree with you is the left, of course they mostly didn’t bother to watch the movie either, they just like the agenda, and you were late spotting Ebert’s agenda if you only caught it since 2002.
I have watched the film and it has no ‘agenda’. Ebert started going downhill as a critic after Siskel died in 1998. Before that he was widely admired by people of various political stripes.