Deepfakes are deeply troubling, because anyone with a computer (a requirement that's getting optional as well quite fast) can fake any video almost instantly.
Consider just one sinister motive that's already making women in many countries cower in fear: if you reject a dude he can just make a deepfake porn video with you and release it as revenge. What's the equivalent of this in the distant past? All a guy could have done is "allege" the woman is so-and-so, which to be sure, probably did ruin some women's lives, but it's almost as if our society has devolved back to that same Stone age at best then.
And we live in a time when "facts" already don't matter much anymore and people are just looking to find evidence that supports their claim alone rather than the truth. To not take this technology seriously, to brush it off because "sensible" people will still pursue to seek the truth, is the kind of smug arrogance about questionable tech that has led us to the current overall shit:sandwich state of affairs to begin with. Let's hope we learn some lessons at least.