They never intended to murder him. They asked him to reveal the password to his Bitcoin wallet and the torture started when he refused to comply. As per their version, he lost consciousness during the torture sessions and could not be revived despite medical assistance. Obviously, I wouldn't trust their version of the events that much. A lot of unanswered questions are there.
And to put it honestly, these guys didn't had much of a choice. Filing a civil lawsuit in India is quite useless (as I found out many times during my business dealings in India). The legal proceedings can go on for many decades, and during this time the accused will be completely free, enjoying his life in luxury. In most cases, the only viable solution is to reach a mutually agreeable deal outside the court.
So, is that not penny wise palm foolish? I guess it was actually their right time for nemesis to catch up with them because of their worn doing, all of them together.