Israel has not "wiped out" Palestinans. It has caused millions of refugees (whom the neighbouring countries have not helped)
It has ignored UN resolutions, but all binding ones were vetoed by the US, sometimes with other countries. So it has not broken any UN requirement that counts legally, but has lost much moral ground.
Individual Israelis have broken the rules of war, as have individual Americans, British, French in current ME wars.
Tony Blair as a leader is supposedly guilty of war crimes, but the International Criminal Court have no interest in him or in any Israeli leader.
Actions that have terrible outcomes for millions of people, even starvation and anarchy, are not necessarily war crimes, just incredibly incompetent and shortsighted.
There is a very high bar for convicting leaders and in the past this has required ordering mass rape and slaughter of prisoners.
The London Blitz was not a war crime, neither were the Dresden firebombings, although both caused hidous casualties, mostly civilians.
The ME countries involved in civil wars have committed war crimes, slavery, genocide of minorities.
Saudi Arabia does not officially wage war - but in reality it funds those who do, including against the UK, France, USA.
Saudi is a monstrous theocratic dictatorship with mass human rights violations of its own people.
It treats immigrants from developing countries like India & Egypt as slaves to be tortured and raped at the whim of the wealthy.