The purpose of punishing offenders is not only to have justice, but to deter other crimes. Well, the settlers already took care of the latter reason by attacking Arabs and their property. Now we can let the wheels of justice turn at their normal pace. Note that as long as the murderers are not caught, there is always the fear that they may try again. Such fear is not a negative factor. The Itamar settlers are deep into Samaria, and will have to leave their settlement once a peace deal is signed, even according to Netanyahu. So this fear may help softening them up and perhaps even induce new settlers not to come there. In short, a bonanza for all forward thinking Israelis. Notice that this consideration applies AFTER the killing and does not justify it. The question is :how to prevent more such killings in the future.
Pro-Hadi forces recapture Yemen's al-Anad military and air base, hundreds of Houthis flee (Reuters)
from the article: Thousands turn out in Jerusalem for funerals of Itamar terror victims