The issue of arbitrariness is very important to our criminal law. The way in which stripping people of their citizenship is arbitrary is that it is not tied to the severity of the crime. It is not tied to the degree of condemnation. It is not tied to anything about the crime.
It is tied to the accident of whether or not an individual has dual citizenship, and that will mean, for example, that it will be a type of punishment that can apply to people who share citizenship with Iran, but it will never apply to people who share citizenship with Egypt. It will mean that it is a punishment that, in advance, we would not know in many cases whether or not somebody would share a citizenship with Syria or possibly the United States. It is discriminatory in that sense, yes.