No it obviously is not. You do not have a right to stay in a country illegally, anywhere in this world. If you want to migrate to a country, you need that country's permission. Without it you are an illegal alien and will, at the minimum, be removed from that country as soon as you are caught. In many places in this world you then may end up in detention - potentially indefinitely, imprisoned, fined, and so on. The US system, which is mostly just giving you a 'free' ride home, funded by US taxpayers, is incredibly lenient.

There is no in group, out group, or whatever else. Go to Mexico or Canada illegally, as an American, and you're getting deported, same as everybody and everywhere else. Vice versa if a Canadian, Brit, or whoever else comes into the US illegally, they're also getting deported.

Yes but first prove illegality. And if you believe killing any person on the streets without any suspicion or charge is legal, cite the laws for it.

Not to make it out to be some paradise, but illegal immigration isn't a crime in Argentina or Brazil. Argentina doesn't enforce it, and in fact I have read court cases of people criminals arriving illegally with fake passport and granted citizenship.

If you are illegal, you can literally show up fresh off of jet and on day one in .ar, file a court case for citizenship, have a lawyer run down the clock for a few years (by constitution in argentina illegal residence and subsistence for a few years = citizenship), and all the meanwhile they are legally barred from deporting you.