There were many Irishmen, and IRA operatives that fought for the whermacht
True.
Thankfully they were massively outnumbered by those who fought the Wermacht, SS, Luftwaffe and Kreigsmarine....
Even many who hated the British stopped well short of supporting the odious regime of Hitler.
The most famous Irish traitor, William Joyce, aka "Lord Haw Haw."