I definitely think the Antifa loons were looking for a riot. They are quite a destructive group.
Of course they were. So were the nazis. And the police probably passively instigated it by letting them rub shoulders. All of these things are likely true. The president is also, technically, correct that there is blame to be shared by many of those involved. On all sides. This an obvious truth in nearly every incident of this sort. And it's completely irrelevant.
A President's reaction to this kind of tragedy isn't about being technically correct. He's not the lawyer-in-chief. He's a figurehead, and as such we expect him to provide catharsis and moral leadership. He failed, utterly, to do that.