What were the sentiments of the gang that attacked Trinity College on VE Day 1945? I would say very much pro-German. Had Germany won the war, those lads would presumably have celebrated the misfortune of the British. There is no reason to believe that there weren't tens of thousands more like them. Some of them did head off to fight for Germany.
Francis Stuart may have been pro-Nazi and Lord Ha Ha certainly was. Whatever de Valera's real feelings, the book of condolances episode and allowing the German embassy remain open, at the very least reflected very poor judgement as to where Ireland's real interets lay in the final years of the war when the outcome was obvious.
Lord Ha Ha was a British supremacist, well known for supporting the black and tans in Cork and therefore British imperialism (well at that time anyway), claiming him as Irish is slightly more typical than laughable.
"What were the sentiments of the gang that attacked Trinity College on VE Day 1945?"
Presumably they took exception to their British jingoistic agenda