SANJAY, so why you like people dont try to understand that more than half 50% population of socalled sinhalas are Tamils actually.
Historically, the socalled sinhala outsiders whom got settled in the south-western coastline started absorbing tamils in, i.e., making them to forcibly embrace sinhala identity else face discrimination. The Ezava/thiyaa of keralas, billava of tulu region and Ediga of Karanataka are such group of tamils whom were driven out of the island by sinhalas.
To add, sinhala spoken vocubularies upto 35-40% are actually belong to tamils, the socalled sinhala culture, life style to everything is same of native tamils. Even the title 'sinhala' doesnt belong to them.