Why DST?

The words of Energy Adviser Dr. Tawfiq E Elahi Chowdhury on not reverting back to the old timing in an interview with BBC Bangla Service on October 25, 2009, have baffled us, because the adviser himself admitted that the length of day and night are quite different in countries where DST is being used for a long time but in tropical countries like Bangladesh the difference is not much.
So, our question is why it has been changed in the first place. People were hoping that realizing the fruitlessness of this move the government would return to the old timing but to our consternation the government has remained unruffled and adamant on its decision which is useless, not helping us in anyway.
The timing we were used to throughout our life was suddenly changed-- thanks to the whims of the Awami League government. It is not right and acceptable, the government must pay heed to people's demand. We hope the government will act wisely.