I don't think it's fair to say that the protesters don't care about the thing they are protesting about: They are actually prepared to be arrested and go to court - that's a pretty big sacrifice, which would indicate that they care very deeply about climate change. Having said that, I don't approve of their methods. Violence as a way of protesting is virtually never justified, deliberately causing disruption not normally justified. (Although stripping in Parliament seems more harmless and somewhat fun
) And the stated aims of this protest seem completely unrealistic.
But I think that it should be clarified that these protests are nothing to do with the subject of this thread: The schoolchildren's regular climate strike. Totally different organisation. Different people protesting. And somewhat different aims too.