[nerdponx]

Making it very expensive to do a thing still reduces the chance of someone doing the thing. How many more murders of passion would happen if murder wasn't illegal?

Laws against murder don't prevent murder from ever happening, but they ensure that committing it is weighed against very high costs.

Perhaps there are other ways to reduce the chance of bad things happening, like reducing opportunities for the bad thing to happen in the first place (eg. not overly relying on computer vision).