OP, posts like yours are the sort of thing that turn people off feminism. It would make people accuse you of looking to be offended, and turning everything into a feminist issue.
There has been a lot of coverage of the Croydon murder, and yes, I agree, I’ve probably seen an equal amount of coverage of the tree.
But sadly, murders seem to be part of every day life. Did you know a man was murdered in Leicester earlier this week? No, I don’t suppose you did. It wouldn’t have made the national news. The taking of another life, whatever the context or sex of the victim/perpetrator, is an abomination, but there are simply too many of them to report them all at the expense of other news.
The other thing that makes the tree more “newsworthy” is the utter and inexplicable pointlessness of it. Not motivated by anger, or greed, or desire for revenge. Literally no possible explanation. And that’s what makes it baffling and therefore newsworthy.