The swamping of western cultures with African and Muslim immigrants is due to the naïve belief that miscegenation, the interbreeding of peoples of different racial types, is the way to achieve world harmony.
It is not.
First, the whole idea is predicated on the idea that people are prone to fighting with ‘other’ people or races.
They are not.
Wars are not a part of the human condition, they are a part of the government condition.
When was the last time that the people of your town or village demanded that their children go off to fight to the death with the children of another town or village?
Governments create the conditions for war, not people.
Miscegenation is not the normal, and will never be. Blacks have been arriving into the UK since the 1950s, but how many whites marry blacks? Not sufficient to be even a blip on the statistics. Note the number of interracial marriages between Anglos and Asians as a comparison. Asians (on average) are far closer to the Anglo (on average) IQ. Asians are also (on average) far more culturally adaptable.
It is not the colour that is the problem, it is the culture and the IQ level. If either is dissimilar, then the chances of romance are slim and, the chances of conflict are high.