No argument about the kind of coverage. As you rightly point out, this is the kind of stuff that journalists and editors salivate and dream about; Celebrity Athlete, beautiful and famous young female, dead, and no witnesses. Add to that Pistorius's stature not just as an athlete, but "the Bladerunner" - A living example of the triumph of human determination and ingenuity over adversity, and this case just about has it all.
The treatment, by the media of the girl, Reena Steenkamp, in all of this is pretty distasteful. The Sun offered us examples from photoshoots, bikini clad and suggestive, whlist there is a grieving family and she is, sadly, a corpse. South African TV aired a pre-recorded episode of a reality TV show in which she had participated. No dignity in death for her, it seems. Hard not to think of the surrounding media circus as a circling kettle of vultures, impatiently awaiting their chance to feed.
And the speculation - I suppose it is sort of human nature. But, fact is, unless you were there ( and I am sure the police would love to know if you were), none of us has the faintest idea of what happened beyond the obvious - namely that several shots were fired, and Reena Steenkamp was fatally injured. Everything else is baseless speculation.
As for the level of polarisation - I would have said that the public, especially in the USA, were possibly more polarised during the OJ Simpson car chase and subsequent trial, largely divided along racial grounds - or at least, that is my recollection.