There is of course the valuable intellignce that can be obtained from a captured terrorist. Since one of the driving aims is to die in the service of the ideoology that radicalised them being captured alive may be seen as a failure to achieve total sucess. It is likely that as it is planned that they will die then they will have had little if any training in resisting interrogation methods.
That said if putting them immediately out of action will save other lives at the time then yes shoot to put them totally out of action.
That said if putting them immediately out of action will save other lives at the time then yes shoot to put them totally out of action.