Does "who cites as causes" mean "(Brigitt Keller) says that (Excessive force by police) leads to (the militarization of the police, persistent impunity, and a mythology that exaggerates the dangers police face and deters public officials from challenging them)"?
Context:
"
Excessive force by police is one of the big problems," says
Brigitt Keller, executive director of the National Police Accountability Project,
who cites as causes the militarization of the police, persistent impunity, and a mythology that exaggerates the dangers police face and deters public officials from challenging them. "I believe the problem is getting worse," Keller says, "but it's hard to say for sure without comprehensive information."
More:
http://readersupportednews.org/opinion2/287-124/21754-how-many-people-are-american-police-killing