I don't see wanting to protect racial purity as a desirable goal - for anyone of any race.
You didn't directly answer my question. I asked about culture. Is it okay for our culture to be diluted into nothingness? I presume that since, to some extent the duration of Af-Am culture is dependent on the existence of an Af-Am racial identity, you are fine with the elimination of Black culture. Is this a fair presumption?
I don't agree with holding on to a culture just for its own sake. On an individual level everyone should be free to choose what culture they choose to adopt and indentify with, without fear of being perceived by anyone as abondoning your group or culture. After centuries of struggle, the option now exists to step across lines that would have previously meant death, and there are clearly reasons that are beneficial to both the individual and to society as a whole for doing so. So why thumb our noses at someone who happily utilizes that option? If you strongly identify with your race, be it Black or White, that's fine so long as there is no intentional negativity towards another race, or towards anyone of your race that does not share that identity, but likely uses other factors to define who they are.
I don't see wanting to preserve the Black bloodline as a lofty goal, anymore than I see wanting to keep wealth within a small group as a worthy endeavour. I see nothing wrong with the assimilation of the Black culture into the dominant culture, because that's simply the way of things. When two groups exist within proximity of each other for an extended period without much assimiliation, that familiarity eventually turns into contempt. It's simply human nature. Black culture will not suffer for it, anymore than White culture will. The relationship will likely be dynamic with both cultures influencing the other. There will be pros and there will be cons, but the pros of doing so will greatly outweigh the cons of not doing so.
Sometimes I think people, especially older people, hold onto their culture as they would a life preserver. To them change is the equivalent of death, and so they treat those who might bring about change as those who would just as soon murder them during sleep. The mentality runs something like "this is who we are". That necessarily implies "that is who they are", and that is the genesis of seperatism and racism. In-group/out-group bias. There is us and we are good. And there is them...and they are not us.
Nothing will change as long as people staunchly refuse to give an inch. You must
give up something in order to gain something. It is for the dominant group to relenquish some measure of their power to us, and it is for us to be willing to leave something behind as we accept our roles and responsibilities and move forward. Black people, as with any minority group dominated by a majority group, stand to lose a great deal more by refusing some measure of assimilation than to hold to misguided notions of group identity.