The whole lot of messages miss the point and exhibit inexperience/ignorance.
The point is kids learn mother tongue at home (in this instance Kannada) and understand it the most. If they are taught subjects of science and arts in Kannada they understand it the best. Dr.Narasimhaiah (HN) used to explain nuclear physics to us in final yr BSc in Kannada for easy understanding and he strongly believed that his lectures are to be understood and not his notes in English mugged up as students are doing in India.
I live in a foreign country. I have always enjoyed the ease with which my children have understood maths & science when I explained the subjects to them in Kannada. Note that before moving out of the country they studied in no less an English school than Baldwin's in Bangalore.
All high-tech developed countries in the world like in Europe (minus Britain), Japan, Russia etc., teach in their own languages. Those who need ENglish, learn it as a language seperately. I have met and worked with plenty of them and can vouch for their brilliant understanding of subjects.
I am not against GOOD English teaching as a language only. But all subjects in MOTHER TONGUE only.