Adam Curtis is entertaining but his generalised sweeping statements are silly and unnecessary.
Yes the world is complex, but it’s not impossible to understand. For example, Brexit: there were many contributing factors but we can identify major ones: globalisation and those left behind feeling resentful; lack of an outlet for those voices due to a rigged electoral system; anti immigration feeling amidst unprecedented high immigration from the EU; propaganda made possible by unethical social media platforms like Facebook; and ruling class power games.
Most of those problems have plausible corresponding solutions. Complicated, but not insurmountable.