Riku nods to himself, that fits with the level of Darkness he had sensed.

"...If you keep going like this, it's going to consume you sooner or later. And if that happens you won't be the only one who gets hurt. ...You know that, right?"

There is no way anyone reaches this point without being aware of that much at least - of the fact that other people might be hurt. Not if they care about them.