Part of that is South India tends to be assertively anti-Hindi for various historical/cultural reasons. Given that, English is the only realistic option for communicating outside a given linguistic community.
I call it Governmental failure of either educating the masses with regards to learning Hindi or them being unable to cater to the local needs (not printing enough forms in the local language). This was in turn exploited by the regional parties who converted this issue to a language-war of sorts, trying to portray that the Central government is imposing Hindi and diminishing the local language. These "movements" were used mainly for political gain. The reason you don't see this happen in the North is because for most, Hindi is a natural fallback language as the script is similar (Devanagari) to their Mother tongue, unlike in the South.
We are pro-OurLanguage, whatever that language. If that feels anti-Hindi to you, one can't help.
You almost are suggesting to be pro-YourLanguage one has to throw out their their language.
For example, this is hardly "pro-OurLanguage" - http://www.thehindu.com/news/cities/bangalore/karnataka-raks...
Also, as long as there is English, its totally useless to learn Hindi.