The only path to peace is through separation

The only path to peace, prosperity and healthy nations is through separation of races that culturally identify with their respective countries.

By keeping both the most intelligent and the most wretched within their own race, both are forced to integrate into their social norm and contribute to it for the better, at the risk of being ostracized. Entire cultures can mobilize as a group, discarding useless and flawed members as natural evolution dictates.

Immigration on the other hand, gives the wretched a way out of natural selection. It also causes them to cluster together and see the native population as an outside threat that they have no reason to contribute to, as there is no sense of shame in taking advantage of an 'other'.

By limiting the uneducated within their own races and nations, only the best people of different races will be able to meet and communicate. This would wipe out discrimination, racism, anger, violence and crime while forced integration only serves to achieve the opposite.

The only people who benefit financially from multiculturalism is the powerful few - Big Pharma, the banking industry and entertainment moguls. They capitalize through confusion and competition because the more people are afraid and lost, the more they want to spend their money to buy a sense of security.

This is all clear as day, yet leftists still refuse to see this truth. Why? Can any liberal give me an answer?