Can't you? Example; Larry died last night in the electric chair for his crimes. You say that was a good thing. I say that was a bad thing. Are we not disagreeing on a fact?
While I don't believe that were disagreeing whether it did or didn't happen, we do take opposing views on the impact (pos/neg) of the event. I believe that is as much a part of it as the event itself.
Right now, aren't millions of Americans disagreeing on facts? Affordable care act-it exist, but depending on who you talk to, it's a good or bad thing.