For the fear of being redundant...
This, basically.
If we are assuming that there is the means to determine with absolute accuracy that a crime will be committed in the future, then I think that measures taken to intervene would be justified.
The assumption that with absolute accuracy future events can be known leads to a sense that the linear aspect of time has dissolved to some degree. So, the argument that the crime has not yet occurred is irrelevant. Normal time lines are no longer in play. For all intents and purposes, the crime has occurred.
However, this is all nonsensical because if it was known with absolute accuracy that the crime would be committed then it would not be possible to stop it. If you could stop it, then the absolute accuracy of the prediction would be thrown to the wind.
This, basically.