The big problem with situations like Heidi Klum or Tiger Wood's wife is that when a black marries a white woman, it makes a huge statement about how great black men must be/how had white men must be/how much white women love black men. There is no way for white men to get back for this. If he marries a white woman, the white woman didn't necessarily choose to be with a white man, just one she found compatable. And if the white man marries a black woman, then he is just contributing to diversity, it doesn't say anything about black men at all.
Also, speaking of interracial kids, I have heard so many people say how attractive they are. My response is that they aren't any more/less attractive than any other kids. I think this is a conditioned response that people can say to make interracial kids sound like they are special, but not weird in any way. I do not have anything against interracial kids, because they had no choice in the matter. I think though that almost all interracial kids are raised to be considered black. I think this is because usually the white women producing them are weak willed, or act very black themselves so the kid will be raised that way. Yet, there are some rare instances when a interracial child will actually look pretty much white, and is raised in a normal environment where they are taught to act like a normal productive member of society and not develop a black identity. Also, there are the cases when interracial kids will actually have white and/or black half siblings. This is a very weird thing, and some families actually take pride in this.
Like I said and others have noted, most white women, even "porn stars," will not mess with black men. But it only takes 1 out of 100 to "prove" the point of the diversity driven people. There's nothing that white men can do that would counteract this, only things that can play into their hands. I think there is some awareness that is going on though. It seems like people of my parents generation are more likely to think that interracial relationships are okay, whearas I have heard many friends say that when they have daughters they will forbid them for having a relationship with black male, and I feel the same way.