Nairac's time in Northern Ireland was complex. His involvement, or otherwise, with the UVF has certainly been cited many times.
The
Pat Finucane Centre stated when investigating allegations of collusion between the security forces and loyalist paramilitaries, that although Nairac has been linked to many attacks, "caution has to be taken when dealing with Nairac as attacks are sometimes attributed to him purely because of his reputation."
I have no way of knowing exactly what happened with regard to Nairac and the UVF, but don't doubt that there was involvement, and also that this involvement was on the instruction of those much higher up the chain.
However, working under cover in Northern Ireland took guts, and lots of them.
I can't help but notice you seem to have a strong Republican bias throughout your posts, which of course gives you a certain view of Nairac. If you come from the Republican community, this is perfectly understandable.