Because one thing that bringing them here does is tie them up within the legal beurocracy and miles of red tape. They can obtain lawyers, sue, and sue, then sue some more. They can get assume rights of American citizens within the American legal system. They can recruit from the prison population. They can also pose and incredible danger to facility guards and the general prison population, some who may have hope of rehabilitation one day.
It's a legal nightmare that only the mind of a democrat could embrace.
Not withstanding the fraud and corruption of our elected justice system... All this is the infability wanabe civilian LE mindset rearing its ugly head once more.