You're missing the substance of what I've said. No one is denying evil people exist. But take a few more seconds to process what I said...
I know that the road to hell is paved with best intentions. My point is that the pavement is not 100% best intentions, some intentions are outright bad, and we should acknowledge that, and prepare to face that.
Technologies are morally agnostic: a knife, a rifle, a piece of cryptography, they all work equally well for the noblest and the most nefarious purposes. It's the humans' task to structure the society in such a way that good uses of technology mostly dominate evil uses.