If you wanted to push, say, white supremacy, to a trans mountain bike riding sci fi fan -- I am sure the content that will do that job is out there. Not with 100% certainty but enough to control a population. The question about controlling the population is only about picking the right reels to show to whom in what order.
If you control the algorithmic firehose and control who sees what, you basically control the minds of the population.
Not by explicit propaganda. Only by nudging and bumping content.
People can make conscious decisions to not want their worldview defined by traditional sources, whether it is Fox News or The Daily Show or whatever. But with TikTok everyone gets something different and who knows how it is geared or rigged.