On the other hand, it may not be necessary. When I say the law can try to prevent my murder, I don't necessarily mean to deprive my would-be murder of liberty or privacy (since those should be protected in the absence of proven guilt). If you put the prevention on the other side, and offer e.g. a police escort or enforced blocks on communication media then maybe you can discourage/prevent my murder without answering difficult questions like intent.
You might well say, "I shouldn't have to do any of that, they should have to not murder", or "that's all fine but who's going to pay". I have a most marvellous answer to those, but is comment is too small to contain it.
