“... if a Indian manager would have done the same in the US you guys simply would have executed him.”
Since you are not a citizen of the USA, it appears that your view of the USA is colored by Hollywood. That is a serious mistake. If you were a citizen, you would know that exoneration, prison term, or execution would depend on what part of the USA he was in when the event occurred. If the Indian manager was in California or New Jersey, he would have been granted citizenship and a million dollar reward for working under hazardous conditions (the valve was obviously faulty). In the mid-west, prison time for stupidity.
However, in the South, you would probably be right. But it would take 12 years to get it done.
I forgot the sarcasm tag in my "execution" comment. Of course I know that nobody is executed in America for an accident. Anyway I am convinced that acting that negligent the managers of Union Carbide did in Bophal would cause a severe prison term. A part of my work is being a security engineer for industrial facilities in Germany. If anyone would do the things in Europe they did in Bophal we Germans would throw him into a prison for a comparatively long time. Not to speak about claims for indemnification. Union Carbide would pay until the last of the victims died.