Take the Boston Marathon bombing - an event they cite as something where this would be useful. Even without it, their was a ton of news video and surveillance video, thousands of images from the attack taken right after or before the bomb going off. Within days, they had video footage of the suspects and a few more days they had killed one and arrested the other suspect.
I'm not convinced having this software would've helped shorten that time frame. Too me, it's more about mass surveillance and going after protesters. Seems to me there could be a whole bunch of innocent people getting swept up with this tool as well.