there were all autonomous individuals


The purpose of advertising is to manufacture desires, which brands across the world spend nearly five hundred billion dollars a year doing. The ubiquity and apparent effectiveness of advertising seems to contradict one of the fundamental assumptions of capitalist society; namely, there were all autonomous individuals making rational choices in pursuit of our own well-being. Advertising uses a lot of rhetorical strategies that are not very rational.
What's Wrong with Capitalism (Part 1), video by ContraPoints

The underlined part sounds a bit odd to me. Am I right "all" here means "completely" and modifies the adjective "autonomous"?

And why is it "were", and not, say, "are"?

Thank you.
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