When the entire non-White world is breathing down your neck waiting for an opportunity to kill you , anything you do to protect yourself is self-defense .
Are you claiming minorities are "out to get" white people?
Minorities are a threat to white people and it's the right of the white people to protect themselves by all means necessary.
Thinking all minorities are dangerous is to live by and spread fear among the white communities. This creates prejudice out of fear of being "taken over" and "replaced" by their minority counterparts. Instead of assuming they want to ruin your communities, try meeting and getting to know some of them to actually find out what they're about.