Even if Israel was a signatory the ICC should only intervene after Israel has done its own investigation and if it failed to hold the relevant standards.
If there were war crimes committed then people need to be held accountable.
The scale of the alleged war crimes is totally different than the crimes persecuted in Nuremberg.
We have investigated our highest leaders, and have found them absolutely blameless. Netanyahu is often found on the same golden cloud that Putin is often seen floating around on.
There’s a reason we have a police force instead of allowing the criminals to investigate themselves.