They certainly did not die for people such as those shown in the video.
If it is the same incident then this was reported by the BBC in March 2012. Their report states:
The Foreign Office said it now believed the attack was carried out by militant islamists, known as Salafists, after Muslim shrines were also targeted.
"It's horrific and wrong and we have expressed to the Libyan authorities our profound distress at what has happened on behalf of those who have loved ones there," Mr Burt told the BBC.
"The Libyan authorities have responded in kind. They are horrified by what has happened.
"These are not actions carried out by the government of Libya, this is an extremist mob that has done this and we all share the same revulsion for it."
Video footage made by the attackers showed about a dozen armed men kicking down headstones and trying to damage the cross.
The BBC's Gabriel Gatehouse, in Tripoli, said the attackers referred to "Christian dogs" and a Jewish memorial was also targeted.
The CWGC said:
"Both cemeteries will be restored to a standard befitting the sacrifice of those commemorated at Benghazi”
