Why are the Copts being massacred by ISIL?

Why are the Copts an Islamic State target

An extremist shown in the Islamic State video released  a fortnight, Sunday,  says the Copts were targeted because of their faith. The video says the beheadings were also retaliation for Osama Bin Laden’s death at the hands of U.S. special forces in Pakistan in 2011. 

Another motive was violence between Copts and Muslims that erupted in Egypt that year over a Coptic woman who was believed to have converted to Islam but was allegedly held captive by family members, according to the video.