Interesting guesstimate, however, can you explain the 1000 altercations per year number? Sounds convenient, even if slightly so, given on any given day you hear of several such incidents.
Also, please understand that I'm not just referring to car-bike altercations, but speaking of the general attitude of locals in case of any and all altercations.
PS - Please know that I had been the biggest believer that this is not true and even if true, the degree of it is as you state. I have often justified such incidents as reactionary to the historic Dravidian oppression. However, it's just getting more spiteful by the second, and without any reason so, just based on the lack of access to a language.