From Reason:

Gun control laws are wrong because they violate the right to self-defense. Gun control laws are wrong because they were historically crafted with discriminatory intent and create racially disparate outcomes today.

These are two distinct arguments against laws that limit private gun ownership. Libertarians, typically among the staunchest of fans of self-defense and self-determination, have tended to focus on the first. But the second is also important, both on its own merits and because it helps people otherwise concerned about discrimination understand why it is inconsistent to support such laws.