There is the brutal nature of the shooting itself, the alleged non-religious statements of the assailant, and the speculation from not only the Father of two of the victims, but also some people who live in the area who feel that it was not only over the parking space, especially as one person said there are plenty of parking spaces and he couldn't imagine why the assailant was harassing Barakat over them.
As the Director of Muslim Affairs at the University involved has said,
"These “devastating murders may or may not be a hate crime,” Abdullah Antepli, director of Muslim affairs at Duke University, posted on Facebook. He cited Hicks’s “history of conflict with the victims over parking space and other issues” and urged caution until more information is known."
You have two groups of people here advocating that is was definitively one or the other dependant upon their personal bias. The fact is that such allegations should and need to be investigated, not simply dismissed as you are doing.