Don't worry, I don't hate you or anything, and you are perfectly entitled to have your say!
They can be spotted a mile off (I can spot them a mile off, anyway). I suppose by the innocence of their 'impartiality'. Trying to make sense of something 'out there', twice removed.
I suppose the best reply comes from Chumplady:
Just someone muling infidelity over without having EXPERIENCED it. The tendency to intellectualize it evaporates when you?re on the receiving end of it.