I think all atms have cameras that has not been news since 1932, also if it is silly to speculate that he killed her for being white why do you run off three reasons that you speculate may have been the motivation
In fact, not all ATMS have cameras. Nonetheless, it sounds like your theory is that this guy knew he would be on camera and still made no attempt to hide his identity. That makes a lot of sense.
I’m curious, when a white criminal kills a black vic, do you assume race is the most likely reason?