If the future can't be changed, having forewarning only causes stress to you. This situation is bad enough already for you to be adding more pain onto yourself like this. Not to offend you, but you really seem like the kind of person who would feel guilty about it for a long time.

[Pretty much the only way Katsuya sees it would have done anything positive, was if any vision showed the killer too, and that's hardly going to be accepted as evidence by most]