It's incredible how for many people this had no meaning, while for me it was immediately clear. Semiotics is a complex art, and perhaps this signal was a bit too subtle for many.
It's a nice gesture to people who likely had some impact on lots of our lives
A ribbon [1] or armband [2] is a really common and subtle way of symbolising mourning, I'm quite surprised people aren't more aware of this practise.
I think a HTML comment explaining why would have stopped me.