@Walter Hinteler,
I think you're saying that an alien in Germany is not required to carry identification papers. This isn't the case in the US.
Do you find it somehow troublesome that the US requires aliens to carry ID while within its borders?
Makes sense to me, and I have always assumed that I need to have identification with me at all times when I am in a foreign country. As you've noted, even if it isn't mandatory, it's sensible.
I've read the Arizona law and I don't believe it allows the police to randomly stop individuals and ask to see their papers, and if they do ask someone for their papers it must in connection with an issue unrelated to simply their immigration status. Racial profiling is expressly prohibited.
Now we all know that any law can be abused by the authorities and this one is no exception, but I think it's rather insulting to the law enforment officers of Arizona (many of them who are latino themselves) to assume, out of the gate, that they will abuse this particular law.
Irrespective of any law, I'm not going to have a problem with a policeman who politely asks to see my identification. I am going to assume that he or she has a valid reason for doing so.
If I don't happen to have any ID on me and the police harrass or arrest me for that reason alone or for some obviously trumped up suspicion, I will have a problem and I will seek appropriate redress. America is not a police state and while they certainly are not perfect, there are provisions in our laws to prevent and address abuse of authority.
Since any law can be abused, the issue should be if the law is likely to be abused, and, more importantly, what will happen if and when it is.
The former we can only draw opinions around, but it seems to me to be properly crafted and I have no reason to believe the Arizona police are any less dedicated to upholding the law than their colleagues in the rest of the country.
The latter requires us to wait and see, and we can be sure that there will be no shortage of watchful eyes trained on Arizona, looking to spot abuse...even when it doesn't actually occur.
Arizona may now be the safest place in America for illegal aliens.