I think attributing that to the use of color is a dramatic over simplification. The capitalization of human psychology stems from one thing and one thing only, our current form of capitalism which prioritizes maximizing short term shareholder return above all else, with long term shareholder return coming in second.

Also, if you're not going to let me pull the Hitler card in this situation, I can just pull the slavery card. What's worse, a population with a high rate of depression, or a population with a high rate of literally a slave? (We have that too in the US because forced prison labor is a thing and is considered constitutional at the moment)

Or what about when entire ancient civilizations had their history erased when conquered?

Or what North Korea is right now?

Like, seriously, you're telling me the use of bright colors is the worst crime ever committed against humanity? We've been using colors for thousands of years, you could at least pick something like Sugar that's actually addictive and causes disease and depression. Or cigarettes which also do that while also fostering poverty cycles. I could come up with so many things worse than using colors.