Same question could have been asked when that Indian student Anuj Bidve was shot for absolutely no reason by a piece of filth called Kiaran Stapleton,
http://www.bbc.co.uk/news/uk-england-manchester-18972079
Reportedly at the trial, Stapleton grinned, smiled and openly laughed at the memory of our son and at one stage looked towards the jury and pointed to his face saying: 'Look at this face. Does it look bothered?'
These kinds of violent acts aren't race-specific and I would argue that this isn't AOG' point, because Mr Stapleton was white English, born and bred.
Perhaps part of the answer is that there are more people willing to kill.
Quite a basic analysis - and I know the stats for violent crime contradict this but this is the impression one gets when one reads of these crimes.
But let's hold our horses...we don't even know the motive behind the murder of Thavisha yet.
I only hope it wasn't a race hate crime, because if it were, then some sections of the media, will have to shoulder some of the home for 'engineering' stories which stoke up race hate.