It's a huge difference. It's the difference between negligent homicide and murder. Both legal and moral thinking distinguishes between these two concepts.
It's fine to note that they are both bad and both mean culpability and liability, but pretending they are literally the same thing is the worst kind of rhetorical device.
They had been warned by locals in both Burma and Sri Lanka for many months that violent rhetoric was spreading like wildfire through users in those countries, and did nothing about it -- seldom even responding to the people pleading for them to do something.
When Sri Lanka pulled the plug on Facebook as violence was starting to erupt, Facebook did then reach out...to ask why their Sri Lankan traffic had dropped off.
This is documented in a variety of places, but for an excellent write-up of these tragedies I'd recommend The Chaos Machine by Max Fisher.
