"If the two accused are allowed to become state witnesses, they will get leniency in court. They should be hanged for their heinous crime," the victim's brother said.
"The accused moved the plea to escape the death sentence. Their plea must be rejected," he said.
The victim's father said that there were enough witnesses and there was no need to make any of the accused as witness.
Out of the four accused who were produced before metropolitan magistrate Jyoti Kler in Delhi on Sunday after expiry of their 14-day judicial remand, Pawan Gupta and Vinay Sharma refused the services of a legal counsel and expressed their willingness to become witnesses on behalf of the state.
Of the six accused, one is a juvenile.
Additional standing counsel Rajiv Nanda said, "Many accused try to be state witnesses to avoid maximum punishment. If the investigating agency has enough proof in the gang-rape case, they should not let any of the accused turn witness as it can benefit them."