Wow, the contrived reasoning in that Twitter statement is beyond belief:

Trump: "I totally disagree with the outcome of the election [...] there will be an orderly transition [...] I will not be going to the Inauguration"

Twitter's interpretation: I don't think the election is legitimate, therefore I disavow my statement that the transition will be orderly, therefore you should commit violence. Also, since I won't be at the inauguration, you're free to do terrorism there without risk of harming me personally.