White unarmed Australian woman getting shot by non-white cop seems to be getting lots of attention, despite your complaint that shootings of blacks by white cops get more attention. As far as the unreported shootings are concerned, they're unreported; I don't know about them and so don't complain about them being unreported. I don't see many stories about American cops, white or otherwise, shooting people, white or otherwise, who were shooting at them; those are stories that are quite legitimately uninteresting, from which I infer that editors are exercising reasonable selectivity.

As far as "white cop shooting black man" stories getting extra attention, see my initial remark that " given that it is known that many (not all, by any means) white Americans regard darker skinned men (there is sexism as well as racism) as inherently threatening, it is reasonable to regard racism as a likely factor when a white cop shoots an otherwise unthreatening black man".