I guess some people just need the attention - she was being filmed, had cameras taking her photo and was clearly smiling brightly.
Less about a 'cause' and more about attention seeking nonsense. These people are never busy people with full lives, they're often quite lonely and want to be part of something, I think. Even if that thing is pretty bloody horrendous.
Not excusing them, I think they're morons, but it's Insulate Britain all over again - I have nothing productive to do in my life, let's make myself 'important' again.
Sad.