To a lesser extent, same thing with ISIS. When LiveLeak was gone, and their propaganda videos were pretty much scrubbed from the web, we lost a lot of actual history, as abhorrent as it all was. It's going to be easy for people to forget how bad all of that was, and more importantly for me- most of the countless videos of them using American supplied TOWS against Assad while also filming the mass genocide...all that is gone, and it's much harder to prove the connection was ever there.
Same thing with Libya and Gaddafi, gruesome stuff was done by western backed rebels, including a revival of the black African slave trade and just killing black immigrants in Libya, and all of that is nigh impossible to prove now.