> The dominant culture is essentially the "default" and is somewhat "self-reinforcing", so generally has no need of an identity-based support group. Thus, when the dominant culture does establish an identity-based group, it tends to take on a different meaning.

You're being so indirect we're forced to guess at what you mean. Can you please say clearly why you think White must be actually prevented from doing this, when all other groups have already done so?

Not why you think they don't need one - why do you think they must be prevented, even if some of them want to start one?