To me, both crimes deserve life in prison without the possibility of parole.  Which crime is morally "worse" is irrelevant and meaningless because we must treat them the same.  The perpetrators of both crimes should be buried so deeply in the prison system that they are never heard from again.  Decent society must be protected from all such criminals, whether they be Arabic, Palistinian, or Jewish.

Of course, if they don't want to go peacefully, then they should be arrested by whatever means necessary, even if the criminals are killed in the process.