It is indeed horribly cruel OP but these things have happened on a semi-regular basis forever. It's not really news.
I agree with PP who said the coverage of the Sycamore Gap issue was very random - I think completely unecesssary. Yes it was sad and a dickish thing to do but hardly warranted all the coverage.
Going back a few years I am thinking of the woman who put the cat in the wheelie bin. A bit of a bonkers thing to do, unfair on the mog, but she hardly deserved the outrage.