If Israel never killed civilians, then their deterrence would be nothing. In spite of this, Israelis are always talking about their deterrence and how to increase it. They know how to increase it, but they don't mention it in so many words. For example: Killing photographers who are filming IDF action is supposed to deter others from doing this. It has worked pretty well. We rarely see photos of the IDF in action, except those that the IDF releases. Killing and injuring peace activists is supposed to deter other peace activists. This doesn't work so well, even though it happens a lot at the dividing wall. The boatload of peace activists was a grand chance to fix the deterrence value. Strangely, all Israels failures don't deter Israel from repeating them. Maybe some people are immune to deterrence?
Opposition leader Isaac Herzog calls on government to allow Syrian refugees into Israel (Haaretz)
from the article: Israel worried by new Turkey intelligence chief's defense of Iran