At some point, an overused word ceases to have meaning. That's why we try to be careful with words - to preserve their meaning.
One may well argue that in Nazi Germany, the trains ran on time, ergo insistence on punctuality = Nazification. But that's not usually what people mean by Nazism. When rational people use Nazi references, they are usually referring to egregious - repeat, egregious (you know, the Holocaust and all that?) disregard for human rights, on grounds of race.
There are two separate issues at play when discussing immigration: legality and morality. Legality is defined as being consistent with the Constitution. Morality is less about what
is the law than about whether this
should be the law.
Bajo is
on record as not being able to distinguish between the two, but the distinction still exists nonetheless. A law can be constitutional but morally flawed, even evil (hence the famous phrase of unknown origin "when injustice becomes law, resistance becomes duty"). Conversely, a rule may be unconstitutional but still right policy, in which case the Constitution should be amended, rather than the law repealed. This is what Justice Stevens is arguing regarding the Second Amendment in the US.
The fact of the matter is that in this day and age, as
@Somewhereinba said, it is by no means a radical idea for countries to control immigration policy. That the Constitution mandates a more open one is fine, but this does not mean that other ideas are immoral - that is a legal argument to be had in the courts. The debate here is whether this is a good or a bad thing. Is it an immoral thing for a country to wish to exercise greater control? Why?
The Nazi argument is a red herring. Nobody except historians would today remember the Nazi Party if their main thrust was at making it easier to deport non-Germans from Germany. That we talk about Nazis at all today may have more to do with the fact that the Nuremberg Laws started with taking an entire class of existing citizens, and removed their citizenship based on race. (Oh, and proceeded to exterminate them).
To invoke repeatedly the Nazis in the current debate, is to demean the Holocaust. It is to take the mother of cheap shots - to use a supremely powerful emotional association towards a comparatively mundane argument. To do this routinely and incessantly, is to hold nothing sacred. It is, frankly and bluntly put, to be an asshole.