there aren't any.

lemmy users just call anyone who disagrees with them slightly on any social or political issue a Nazi. especially if they argue that those issues are complex and multifaceted instead of being a black/white moral issue.

immigration is complex. what is the 'correct' volume and distribution of immigration to allow? most people don't even attempt to go there because whatever answer you provide will get you called racist. should American immigration policy, for example, favor people from Latin America over people from southeast Asia? there might be good and clear reasons why... but if you dare to argue or explain those reasons you are going to be considered an anti-Asian racist. should certain groups based on wealth/income, religion, language skills, etc be given favorable status over others?

The current system has it's winners and losers already. But even acknowledging that is not an issue that most commentators are willing to touch, because they will be pejoratively labeled for doing so.

When you get into the details of this it's hard not to get dirty. Thus people only want to talk about it at a very high level where 'immigration good' or 'immigration bad' is the only discourse.