Err, the original instruction from the British government was to avoid partition and preserve a united India.

Ultimately self determination involves taking responsibility.

If a lawyer on mars drew an arbitrary line down my street and said people on the side opposite mine were "not of my kind" I wouldn't start murdering them and trying to move the line.

"It's more complicated than tha..."

No, it's not.

These discussions are difficult because events happen as series; what is meant by responsibility and "who's fault"? Is everyone who participated in the series of events to blame as they did not prevent it to progress? In what ways are drawing pertition lines and performing violence similar and different in terms of guilt or "faultiness" (and is there any point in discussing it)?

You may not even disagree; you and GP state different things which may both be true depending on what is understood by "fault"