Why do you assume no footage exists? Why do you assume that any footage the tower has should be released to the public immediately?
I understand there is a public Voyeur interest in seeing crashes, but how does releasing footage of accidents aid investigation or safety outcomes?
I also read scuba-diving accident reports. They reinforce best practices that I also explain to others in the context of what I've seen in said reports over and over.
Crashes aside, a high-res Tower view would also make a great live webcam for enthusiasts to watch while listening to LiveATC.
Far more useful would be an interior cockpit view showing the crew and the actions they were taking but a lot of that is recorded to the FDR on newer planes too.