Consider MP3 files. Any audiophile will tell you that a compressed MP3 file is a piss-poor representation of the true sound. The best experience is to listen to a band live, then vinyl, then FLAC.
And yet the majority of people listen to MP3 files. They strike the right balance of file size and sound clarity for an overwhelming amount of systems, doubly so since online streaming took off. So now that people have become accustomed to the sound of MP3, they are not used to anything else. They are convinced that an MP3 file is the "true sound" of the song.
Right now deepfakes is in its infancy. Personally I think it is improving at an alarming rate. If I shared the moon video on Facebook I am willing to bet most people would think it is real. They don't notice the clipped speech, the subtle double head nods. Their minds are not as critical of video as you and I are. So to them, they are convinced it is real.
What happens when only machines can detect if something is authentic or a fake? What happens when not all site administrators scan for videos and fail to mark them as illegitimate? What happens when courts use deepfakes unknowingly as evidence to convict someone, or impeach a president, or fire a worker for sexual harassment? We have already seen what happens when "verified" twitter accounts are compromised - what if a CEO puts out a video announcing some controversial new endeavor, or admission to fraud?
There are very real concerns about this technology and I believe it will very soon become a weapon that takes misinformation and turns it into very real consequences.