Lack of digital footage doesn't seem incongruous. If we accept that aliens are capable of travelling vast distances to be able to visit the planet then they're capable of technology significantly advanced from where Humanity currently is. With 'magic' levels of technology, the ability to disrupt a CCD sensor doesn't seem beyond the pale.
(I don't think I actually believe aliens are here and walking amongst us, but I'm not sure I can see a lack of evidence as being evidence of them not being here either).
It would be ironic if the aliens were here all along but were using cloaking devices, and the UFOs people were seeing really were swamp gas, Venus, etc.
(I don't think I actually believe aliens are here and walking amongst us, but I'm not sure I can see a lack of evidence as being evidence of them not being here either).