I explained this in a previous post, but let me reiterate. Its not punishment. Or at least, the real question of whether it is punishment is the crux.
I'm not for adding more punishment, and some restrictions may be seen as punishment (I'm open to discuss that). What I don't object to is tracking individuals and notifying neighbors, even if this decision is made after the commission of the crime. There is no freedom to live without the stigma of your previous crimes following you.
Did the government commit ex post facto violations when it created forms that ask, "Have you ever been convicted of a felony?
I object because I do think it is more punishment. I interrupt it as probabtion after the sentence is complete.
I agree about the stigma part, but that is a social issue, not legal.