Saying that you will execute perpetrators of "horrific crimes" has some serious drawbacks: 1. It is vague and undefined. 2. The key folks you are trying to deter embrace martyrdom so this doesn't really serve as a deterrent. 3. When Israel (and the IDF) isolate the cells to a specific locale, they try to "remove them from the field, permanently" anyway. 4. Those punishments have pretty irreversible outcomes in the case of error. There is no upside to doing this in a public forum.
First refugees travelling on Hungarian bus arrive at Austrian border (Reuters)
from the article: Knesset passes law to strip terrorists of Israeli citizenship