Avi K
I am well aware there are halachot (let me stress, halachot) in regards to people who present a danger. The last time I know these questions being non-theoretical was in Europe during WW2.
Equating cremation of eichmann (which I have no idea if it was done seeking daas Torah, and quite frankly I doubt it) which has no negative connotation for their ideology (many nazis chose cremation for themselves in their will, and I do not recall eichmann protesting it during the trial) with desecration of human bodies which sometimes had to take place in order to safely eliminate evidence after a person had to be assassinated, with a hypotetical deliberate desecration of bodies, speaks for itself. Moreover, the assumption that such a step would scare the aspiring terrorists into becoming meek lambs and fear the might and strength of the Jews, also speaks for itself. What will realistically happen, everywhere in the world, we all know. And, sorry to break the bubble, terrorists are not exclusively motivated by their fantasies of young ladies in the afterlife. They are prepared to do what they do because they believe that is the right thing to do.
Public safety and order, if that is the high priority of the Israeli government, should indeed be implemented, but the statistics on violent crimes and those on vicious crime, somehow tell me that if there were miracolously a peaceful solution of the Arab problem, this would not turn the country into a paradise, would it.
Finally I am well aware of the correspondence between Rabbi Moshe Feinstein and Ronald Reagan on the subject of death penalty in USA. We do not know if nowadays Rabbi Feinstein would pasken the same way (I am sure we all remember the first death penalty trials i.e. frank coppola etc. where the legal debate was not superficial, attorneys studied the papers and the sentence was not written before the trial even started), what we do know is that at this time, multiple poskim in USA say it’s forbidden for observant Jews to be on juries when the death penalty is involved – period.