On the surface it appears puzzling, but the truth is that the mantra of "Never again!" merely allows the ends to justify the means, and to cast questions of loyalty, intelligence, or sanity on those who dare question the means. In this way, we say that "What happens to my tribe means everything. What happens to my neighbor's tribe is his own fault." The sorry irony is that (while not equivalent) "Never again!" was also the response to the abuse stemming from a treaty at Versailles.
4 UN peacekeepers injured in Sinai and taken to hospital in south Israel (Haaretz)
from the article: A sick police force