The IRA basically didnt exist by the late 50s into the 60s.
The native, Catholic Irish were discriminated against widely, and began a civil rights movement in the 60s.
The Ulster Protestants, really more Jew than Christian, started the violence, burning literally thousands of Catholic homes.
The first British soldier to die in the conflict, Hugh McCabe (home on leave), was killed by RUC gunfire. The first RUC officer to be killed, Victor Arbuckle, was shot dead by loyalists, probably the UVF.
historyireland.com
the Catholics initially actually welcomed the British Army out of a sheer hope of protection.
The tendency of the Brits to side with the 'Loyalists' however resulted in a resurgence of Loyalist violence.
Bombings in England by the IRA were not very different from Jewish bombings in Palestine- only those Jews were recent immigrants to Palestine while the Irish were fighting for their own homeland.
mepc.org
unz.com
The rapid rearming of the IRA from the US and UK stopped the ability of Judeoprotestant gangs to murder and bomb at will without repercussion.