That's a reason. Presenting the demonstration without the reasons is as bad as presenting the reasons and not reporting the demonstration. Reporting needs balance. Violence makes news. It's too bad, but that's how it is.
Different newspapers report the same event differently.
That part that showed the doors closing could be a great thing about the deaf ears of the Supreme Court. If I just had the evening news, I'd begin with the marchers, mark the size of the crowd, and tell why the march was held and what the grievances were. For human interest, I'd use the old lady and reinforce her with Abernathy. The background here is important so I'd use it as a lead, and I'd use the voices of the Indian leader and Abernathy. Our paper doesn't identify race unless it is pertinent to the situation.