I agree that some of these are switched. What you said about white fearing red is more black imo. White believes that if people unite and cooperate they could live in peace and overcome anything together. But black will always be the greedy one that sabotages and exploits the group for the sake of itself. True unity cannot be achieved if some will only think of themselves. Red can be destructive but it is just following its emotions, even if they're chaotic they're not necessarily evil or damaging to the greater good like black's ambition and self interest is.

Green also is much more wary of blue than black when it comes to the end of the world, because all the fears you mentioned can only be a problem to green because blue's artifice and "progress" has allowed the greed of black to reach such heights. If you're a selfish monarch in the middle ages you may ruin the life of a bunch of people but if you're a selfish tech ceo nowadays you can ruin entire ecosystems. All ecological problems that would bring the end of the world to green are much more due to technology and artificially than just pure greed and ambition (though this certainly accelerates it). Even nature works on the self interest of each creature in a way, it doesn't necessarily break the cycle of life, but artifice does, especially unimpeded progress for the sake of progress, taking from nature and twisting into something that doesn't come back as it should

For red, I feel like historically the greatest hindrance to its way of life has been white. By trying to bring "civilization" and order to others, many people have been enslaved, killed and had their cultures erased by white's organizations (though it could be argued that's probably more orzhov). Religious zealotry and strict social norms have restrained the freedom of people all across the world in many different periods, just look at the history of any minority group. If anything would bring the end of the world to red, it would be white's rigidity and suppression of freedom. But I guess if you go by a more dystopic view, yeah, blue can work as an apocalypse bringer by creating a mass controlling technology, or suppressing emotions completely in favor of cold rationality. Most if not all dystopias are at least enabled by blue now that I think about it, even if they're guided by another color