I find these threads a bit frustrating, as they remind me of when the Headmistress would say in assembly 'There is a thief in our midst!', and everyone would blush and panic in case they had accidentally robbed a bank on the way to school and forgotten about it. Often it meant that someone had lost their purse, or left something in the changing rooms and reported it as stolen genuinely believing it was, but even when there had been a actual theft, there was no point in making everyone feel bad.
I don't like the 'some posters' accusations (although I understand that naming names wouldn't be in the 'spirit of GN'). They can be very passive aggressive, and rarely hit home for various reasons. The 'offender' might not see their response in the same way as the accuser, so won't think the comment was about them, they might not care in any case, or they might think the comments are about someone else. Meanwhile, someone else could be feeling really bad, thinking that they were the one being targeted, or as someone said upthread, it could also be that the accuser is annoyed at 'losing' the argument, or doesn't like being proved wrong.
I haven't seen many requests for people to provide data before passing an opinion, but where I have it has been because the original claim was potentially dangerous (eg regarding vaccines) or outrageous (can't think of a real example, but you know - lizard invasions and the like).
I agree that sometimes there is a need to clear the air, and I'm not sure what the best way of doing it is, but I'm not sure that this is it.
I miss a lot of what goes on, I think - although my favourite threads tend to be the political ones - possibly this is because I am not remotely interested in the RF threads, so I don't bother opening them - it seems to be the best way to a quiet life
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