Why hold "sex offense" out as something special? Why not start tracking thieves and murderers as well? I'm assuming information about criminal records is part of the public record anyway, so why do they need special lists and measures for one particular group of convicts and not others?
I don't want thieves and murderers in my home or in my neighborhood any more than I want sex offenders. Hey, we could even take the whole criminal record and put it up on Google maps. "Search for: Rapists -children -dogs in 97006" Why not?
If they feel a PARTICULAR case calls for further monitoring, they should make it explicitly part of the sentence. Otherwise, best not to apply blanket rules. Soon, they'll be wanting the passwords of drug dealers, "domestic terrorists" and the like.