OP I was going to ask how you knew they were middle class.
And in the BBC article
'"It's time to stand up and be counted," activist Gully Bujak, 28, said. "Doing this today may land us in prison but we're on the right side of history."
Valerie Brown
IMAGE COPYRIGHTJOAO DANIEL PEREIRA
image captionValerie Brown: "Investing in fossil fuels is murder"
London mayoral candidate for political party Burning Pink, Valerie Brown, 68, was among the women arrested on suspicion of criminal damage.'
There's a pic of Valerie brown she's not white.
So
You don't know what will happen to them (and as others have pointed out people don't go to prison for smashing windows)
You are wrong that they were all white
You assume they're middle class