Maybe that's exactly what you should do, sit down and have a pint with him.
You'd possibly then see it all in a different light once you've heard it all from the horses mouth.
That's exactly the point though, isn't it? How can people see it all in different light?
I'm guessing that the vast majority of people broadly agree with LargsTON and CHC on the case: they don't know the truth of what happened and had no personal involvement, they back no side in the case and accordingly they don't view Jim Gallagher or the Trust much differently on the back of it.
However, that's simply not all there is to it, because the behaviour of you and your master is an issue above and beyond the outcome of the case. Regardless of the rights and wrongs of the court case, the way your master has conducted himself - that's him specifically, independently of JG - is absolutely disgraceful and even if the case had gone entirely, 100%, unequivocally in JG's favour, it wouldn't change that fact.
Sitting down for a pint with Jim as you suggest and hearing his whole side of things wouldn't change the facts of how your master behaved outwith the realms of the case. It's not about the rights and wrongs of the case, it's about everyone seeing through his behaviour that Newall is an absolutely despicable human being. Do you really, truly, honestly, not see why people view him (and by extension yourself) that way?