A large number of immigrants will not only cause security issues, but will also compete with local residents for jobs and share social welfare. It would be truly strange if the local inhabitants had no opinion in the face of such situations.
Although most of the current population in the Holy Dragon Land have ancestors who came from elsewhere, they have lived here and taken root.
Their ancestors have contributed to the economic prosperity of the Holy Dragon Land for generations, allowing this generation to enjoy various superior welfare benefits and job opportunities.
But why should these newcomers be entitled to the same welfare benefits as they themselves receive? What have they done? What have they contributed?
Concerned not with scarcity but with inequality, the same principle applies here. One person works while another doesn't, yet in the end, they both receive the same food. The person who works will inevitably feel resentment and unfairness.
