The leading cause of “grief lasting longer than two weeks” is Barack Hussein Obama. There’s much grief for what he’s doing to America. We thought it could be cured on Nov. 6th, 2012 but the disease lingers and still affects millions of Americans.
And being a malignant narcissist he's totally incapable of any feelings of empathy towards other human beings, so the concept of "grief" is foreign to him. He can make rules for the ants below his shoes with no compunction because he doesn't relate to them.