Rasta is as Black as the infinite Iniverse.
At the same time, Rasta is not about embracing pseudo-scientific notions about other races being "devoid of spirituality" and "lacking humanity."
Like I've said before, these ideas arise mainly from environments like the U.S.A. where Black people are a minority in an extremely racist environment. Not saying there's no one in the Caribbean who thinks that way cos there are, but such ideas are much less prevalent.
It's not for I to say no white people can be Rasta. It's not for I to question the elders who say they can. I do tend to be quite suspicious of them however. Because it's true that many white people have a tendency to want to take over things. This is not an inherent genetic characteristic of their race, it's how they've been trained since childhood.
However I know for a fact that there are white people, or pinkish people or whatever you want to call them, who have just as much humanity and spirituality as I do. I know this for a fact because I know them personally. No one who DOESN'T know them personally can tell me any different.
If such people choose to associate themselves with Rastafari, then they don't "add" anything to Rasta AS WHITE PEOPLE; they bring whatever they have to the table, as human beings. This could include finances, it could include skills or specialized knowledge, it could include zeal, courage, perseverance or whatever qualities they may possess. One thing it should always include, is said people spending more time trying to annihilate racism in their own white communities, and less time hanging around Black Rasta trying to copy our style, language and mannerisms.
Spend some time in Guyana sometime. You would see two Black races (African and Indian) talking the most racist s*it about each other. And acting on it. Then you would see how the disease of racial prejudice can affect any race not only whites, and maybe you would see why I see it as way too simplistic to look at everything in terms of Black and white.
I hate to repeat myself like a stuck tape-recorder, but I've said it before and I'll say it again: Rasta is neither a Hippy Rainbow Gathering, nor a branch of the Nation of Islam. Rasta is something else entirely. At least it is to I and to everyone I know personally who's a Black Ras from the Carry-beyond.