I’d like to point out that video of unknown provenance can be easily staged. For all we know the perps in this video are Assad’s guys, and the victim might be a captured insurgent. It ain’t all that difficult to take off your uniform and put on some old ratty clothes.
Presumably somebody cut somebody else’s head off, but we don’t really know who.
I think we sometimes allow the strength of our emotional response to a situation to overflow into an assumption that the story being told is true.
For instance, when a particularly horrific crime is committed, people automatically react with anger at the person arrested. But it is often forgotten that the person arrested may not be the person who did it. Our outrage is not evidence of guilt, in itself. But that’s the way our minds tend to naturally work.
What you are alleging might be true, were it not for multiple newspapers, both in the U.S., Britain and other European countries reporting on past instances of beheadings, with onlookers saying that it was Syrian rebels who commited the crimes.
Or are they in on it, too, part of the staging?
Believing that is akin to Trutherism.