> The ones willing to defer to an ICJ investigation?

What state has ever consented to an ICJ investigation that was focused on interrogating its military command or other sensitive military assets?

> Hell, an IAEA inspection?

If a state is an IAEA member, their nuclear program is (ostensibly) not a military program, so there should be no military secrets at risk.

> America's infinite tolerance for Israeli transgression

Even if we accept the extraordinary claim that the US would have tolerated what it knew was an intentional attack on an expensive ship, at best that means that we can't infer anything from the US reaction. There are plenty of other reasons to doubt that the attack was intentional. I.e. it's extremely difficult to imagine any risk-benefit analysis under which it would make sense for Israel to suddenly attack a neutral superpower in the middle of a war for its survival.