Reminds me read this by
Noura Erakat
Israel has been pretty good at changing law. Erakat argues there is a body of law related to conflict and war. A lot built up over years. One aspect is what she calls customary law. Its up to States as a whole to agree peace meal changes to what is legally acceptable.
There is no one sovereign state to uphold international law. Customary law is that which states agree loosely on.
An example related to Gaza and this extraordinary attack on Lebanon is extra judicial killings.
Take Gaza - Israel has justified attacks some attacks as being about targeting Hamas leaders. With high death toll of civilians unfortunate.
This is not self defence. These are targeted assassination attempts.
Erakat points out that extra judicial killings like this were frowned upon. Then Israel pushed the envelope of what was accepted as customary law and its now accepted.
Id say that if pushed Israel state will argue by extension what its done in Lebanon counts as targeted killings within what is now accepted practise as customary law.
So to answer your question what do we call it when Israel is the perpetrator? An answer is that they are yet again expanding what is acceptable rules of engagement when a state takes armed action.
That is unless the international community as a whole condemns Israel ( alleged) action in Lebanon.
Noura Erakat discusses the Jenin invasion and Israel’s efforts to unilaterally change the laws of war.
jewishcurrents.org
This article gives good short summary of Noura Erakat ideas in her book