Why Iranian students don't return to Iran?

Back on March 3rd, Radio Zamaneh interviewed two Iranian students on the reasons the Iranian students stay abroad after their studies rather than heading back to Iran (titled چرا مغزهای جوان به ایران باز نمی‌گردند؟). It was a sober talk; many reasons brought up like personal dignity, quality of life, economy, opportunities for making the dreams come true, professional ambitions, ...

Having said that, it was a pity that the socio-political issues were pretty much ignored. Though the focus was more on "personal reasons", it was left out that most of those personal issues stem from socio-political issues plaguing Iran today. Most people in the developing world face similar issues but they don't feel like us that their voices are completely ignored or they can't participate in building their country. Look around and see many students from India, South-Korea, and even China head back home after their studies. Further, some of those who opt to live in the West would end up serving, even unintentionally, their homelands better through establishing professional and economic ties. Probably there is no better example than Jewish professionals in the West helping Israel. I even see Chinese professors or Indians in hi-tech sector establishing startups in their countries these days.

Our educated people have had a minimal influence in shaping our country. It sounds something is seriously wrong with us :(