It was a sweeping generalisation (I for one disagree) but the original question was "why do the IRA get all the publicity"... A: because the British establishment wanted it to be so and anyone opposing their view was, de facto, the "bad guys".
Ok, I'll concede anyone with any intelligence will struggle to see "good guys" from the troubles or indeed any sectarian or terror-fought conflict (except Americans - they MUST have good and bad guys in everything).
Personally, I am in favour of a united Ireland and so politically fall on...
UDF/etc wanted continued unity with UK, IRA/etc wanted unity with the Republic. A Brit will feel the IRA were the bad guys and the Irish will feel the UDF are.
Pretty basic really!
With his "immunity", presumably this is a fishing trip for information that at least gives a full picture of what happened. Maybe they believe he will give them enough to get someone else who doesn't have a GOOJF card. Wishful thinking. Can't see him ever grassing up his old comrades. Hence...