Not to sing Irish songs because they don't suit your taste or accent is fair enough - not to sing them because you 'don't like the Irish and they don't like us' or 'believe that they are all terrorists', is as racist as saying you don't sing West Indian songs because 'they are all here to steal our jobs and women'.
The Anglo-Irish repertoire has some of the best versions of British songs and ballads as are to be found anywhere, and native Irish songs like 'Brave Michael Power', 'Sprightly Young Damsel', 'Lismore Turkeys', 'Well of Spring Water', 'The Devil and Bailiff McGlinn', 'Seven Irishmen' and 'Farmer Michael Hayes'..... and many, many are imminently singable wherever the English language is spoken and Anglicise perfectly. Bert Lloyd sang a number of Irish (and Canadian) songs - and nobody noticed.
Anybody with a serious interest in ballads would be barmy not to take a look at the 50-odd Irish versions which have turned up over the last four decades.
Can't find the quote but Child wrote somewhere "I have no doubt that the continuing story of the ballad is to be found in Ireland", and he wrote to 'Notes and Queries' requesting that people search the 'non-Celtic' repertoire for them.
To confine your repertoire to 'English' songs (whatever that means) is odd, to say the least.
Jim Carroll