You're absolutely right, they should be executed because of what they've done (though I concede my magnanimity is slight in admitting a point that was mine. ) So prove that in court and carry out the sentence. Again, it shouldn't be all that hard, unless we screw the evidenciary pooch because we've prejudged them guilty (see Simpson, Orenthal James. )

In America, people have the right to a trial before we execute them; call me old fashioned, but I prefer it that way if only because I run my yap about as much online as that poor SOB we had the Syrians torture for a year because "we don't torture. " If we find them guilty their lives may well be forfeit, but convict them then execute them, don't just execute them.