But the emphasis is on the 'what' happened, and by extension
the 'how' and 'why'...
'What' happened you made quite clear.
'How' is pretty easily explained. You are a guest and anybody can post under your guest name.
'Why' is a bit trickier. Some people get their jollies doing things like this I suppose. I have never understood the thrill in that. That 'why' is probably a big part of the problem that leads to the type of behavior that gets threads closed. Some folks like to stir the pot just to see what floats up.
I don't mean to single you out by the way. It is just that you made a particular complaint that could be easliy remedied by joining.