shaardulaji,
Prof. Sen is "untouchable"
He was never very solid in maths. Which means he does not always recognize and distinguish between an "axiom" and "logical conclusion from a set of axioms". Over the years he has become increasingly axiomatic. His roots are in social choice theory. But anyone familiar with the maths behind that theory will know that the axiomatic assumptions are pretty severe and restrictive.
A very simple problem with his "forget the past" approach is that the past is ever present in the present and is also going to be present in the future. A simple denial of the past is ideologically claimable, but it is itself an "injustice". Past injustices can create conditions and advantages which currently existing societies, groups or entities may be enjoying. Such advantages themselves may be giving or causing continuing and further injustices. So what is "retribution" to Prof. Sen, could be "legitimate compensation" for me.
Yes, the issues have to be looked into. The past injustice of destruction of the environment at the hands of Europe, led to immense capital accummulation in European hands and destruction of capital in "colonies" or the rest of the world. If now we go on further adding to this destruction, from the non-European side, yes both Europe and non-Europe suffers. But non-Europeans gain too in capital formation and development. If non-Europeans do nothing, they continue to suffer from the consequences of European destruction, do not gain in developmental terms, but Europe only suffers from its own acts, and continues to enjoy superior capital concentrations.
A "left leaning" Prof like Sen, should have remembered all the talk about unequal trade and its role in the neo-colonial subjugation of the non-European world. How was this unequal trade sustained? Because of the initial capital formed and extracted from the rest of the world, and then using it to create the mechanisms to preserve that capital - military dominance of the world. It was only when the fundamental lack of economic dynamic within the European system - the natural resources, and the quality human resources, needed for long term sustained productivity were always lacking, (and hence the periodic need to "go out and conquer" - basically looting forays on a global or regional scale) - that Europe had to compromise and allow the sucked dry and repressed "rest of the world" to recover on productivity. Such recovery would be crucial to maintain Europe's consumption - so that it could go out again and extract more for another period of time into the future. (A very similar economic and human resources problem made Muhammad disposses the Jews cultivating the oases of their land-ownership rights but keep them on land as cultivators - the bedouin tribes simply did not have the skill to grow the stuff, and they had to be allowed to produce so the "Muslims" could extract their periodic surplus).
This was the beginning of the international financial flow touted as "modernization" and "opening up the world for free market" (Prof. is a supporter of strictly market based "development") in which "everybody gains".
So Europe continues to enjoy power, dominance, and the ability to extract further resources because of injustices they committed in the past. If they want others not add to the costs of the damages they themselves had started, they have to pay for it. They have to transfer the technology, capital, and surrender the military advantage - all resulting from that initial injustice - and all used to keep the rest of the world still at a disadvantage, so that a less-destructive path towards development can be charted for all.
Prof. Sen's logic does not stand up to any resonable analysis.