"On the other hand, I often agree with McGrath. But one has the impression he could never possibly bring himself to admit a mistake, and that tends to put one off."

Chastening comment there , toadfrog. I'll try to keep it in mind. I'm sure I have admitted to mistakes, more especially on factual matters. I try to avoid making personal attacks, and if I slipped into doing so, I hope I'd realise that and apologise. But I probably do tend to dig in regarding opinions, and maybe I overdo that sometimes.