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Crows are a very social animal. Also, whenever there is a predator around; they all start ka'ing in unison and swarming the predator. This fits whites defensiveness. And mechanically look like "destroy target attacking creature" which is a very white thing. This also shows whites organization and relying on the group. They can even plan. There are other examples, but I don't want to overwhelm everyone.

You are far from overwhelming anyone. I would argue that social behavior is not enough to classify something as white. Not only that, but no matter the actual behavior of any given animal, they are going into a color based on the tropes fron literature and other media.

Crows are seen as calculating, intelligent, carrion eating and sometimes evil.

Hawks are seen as beautiful but deadly predators.

Angels are seen as the right arm of justice and protecting the weak.

Anyone could probably dredge up some kind of argument for why any creature type could be any color.

In any case, whether bees should be red, bears black, zombies white, or platypuses green is not that big of a deal. Most people seem to accept where wizards put certain things based on tropes and flavor. usually there are one or two colors that best represent the idea that most people have of any given creature type and that is wizards' goal.

The point is that while green and white both may value community, green is also the color of the wild, the natural, evolution and competition. White is the color of Order, justice, and equality.

It is very clear which of those two fits Angels (as a fantasy trope mind you) the best. Note that while order justice and equality are traditionally viewed as such, they really don't belon on the scale of "good vs evil"