The notion that an international court is worthless bureaucracy, and war crimes make no sense, because one particular country can ignore it and them, is a bit strange.
The rest of the world could, and is apparently beginning to, set them up and submit to their rulings in limited but important ways. This could present these countries with an advantage, long term, in dealing with a rogue country - they could, for example, find themselves negotiating such things as war reparations as a united body against any rogue country.
And the pressure of international law has proven to be a factor that people like Kissinger or Radosovic have to consider.
To find citizens of a democratic republic unable to see the value in declared norms of behavior publicly endorsed and formally supported, when their very own society is essentially based on such voluntary submission (however imperfect) to agreed rules, is disturbing.