On the one hand, sure, I want to be free to murder people if I really want, and free of creepy 24/7 observation, and people shouldn't assume things about me even if they're 100% accurate, and I would never trust anyone who wants to put cameras on me who claims it comes from a desire to reduce murders - let alone if it's lesser crimes.

On the other hand, if we really had a magical technology that allowed us to predict and stop murders with perfect accuracy and without the usual surveillance indignities and risks, it would be criminal not to use it. That hypothetical wouldn't be just another way for the powerful to assert themselves. And the problem with using it for other crimes is mostly that certain actions shouldn't be criminal, i.e. that the law is not lenient enough or not specific enough (perhaps for good reasons). In an ideal world with better institutions, we would resolve such a problem by changing the law.