Uncontrolled influx of millions - mostly with poor finances and very different cultural backgrounds and values - strain a nation's resources, infrastructure, and social cohesion. It exacerbates housing shortages, burdens public services like healthcare, and contributes to economic friction amid existing downturns. It also poses risks to national identity and security, as we are now experiences in many countries who allowed this to happen, as opposed to countries that enforced legal immigration. It complicates integration and social stability. It's unfair to legal immigrants. This is why sovereign states implement rigorous and dynamic immigration controls and capacity limits based on the nation's ability at the time. There has to be sustainable absorption. Countries are not homeless shelters or free handouts; they are the result of blood and tears of the patriots who fought and died to create, defend, and build that nation. Every nation has its values, and it's not the right choice for everyone. China is definitely not a country for me, nor are the CCP's values acceptable to American culture. In short, vet whoever comes into your house, and don't let people sneak in through the backdoor.