Because if he (had) come from there it's possible someone from there was the one who killed him (or had him killed and got to choose how) hence making the dismemberment make more sense since it's an odd thing to see in a random murder.

>By the way, even that information is totally false, he NEVER lived in bangladesh, so he doesn't even come from that culture. It clearly says that he was a New York tech entrepreneur.

Ok then, my bad. The greater point still stands.