Is Israel Acting Irrationally?

Reflecting on his summary of Israel's actions beginning late in the Bush presidency and throughout Obama's, Andrew Sullivan sums up:

This, then, is what appears to me to be Israel's current position - even as it faces an existential threat from [Iran] and a demographic collapse from within: No retreat - in fact, retrenchment - on settlements; no regrets on Gaza; an attempt to bounce the US into bombing Iran by making and wild, emotional threats to do the bombing itself.

These are not the actions, it seems to me, of a country acting rationally in its own interests or of that of its allies.

They are not the actions of an ally willing to give and take.