If Bin Laden had decided to give up his terrorist ways and instead put his efforts towards peace in Afghanistan then i doubt many would change their minds that he was suddenly anything less of a murderer so i fail to see why the case with Martin McGuinness is any different.
Some are pointing towards his efforts in the Northern Ireland peace process but they seem to be overlooking the death and destruction that he was directly involved in which made Northern Ireland such an unstable place in the first place.
As a member of the IRA's ruling 'army council', he was part of the decision making process for its overall strategy and tactics, and approved operational policy and been a key figure within the IRA for almost all of the Troubles.
McGuinness spent a decade in the power sharing role with the Democratic Unionists which helped to end 30 years of conflict in the country, helping to negotiate the 1998 Good Friday peace agreement and securing IRA arms decommissioning in 2005.
While history will show that McGuinness changed his course to create change through politics, he died peacefully at 66, a luxury so many of his victims were never afforded in his original role as terrorist and commander in the IRA.