Besides for those cases where recourse to the secular courts has been permitted by a beis din as the only way to stop a serial offender etc. Joseph is absolutely correct on this, and it is beyond my understanding how this is not obvious to every frum Jew.
The liberal brainwashing of Jewish opinion on this kind of issue was taken to an extreme during the Martin Grossman saga, when I remember being absolutely sickened by some of the comments on the news articles here on YWN condemning the efforts to get him a pardon and effectively saying that since he was found guilty by the law of the land he should rightly be put to death. Unbelievable.