We've already broken into her personal quarters. Gaining additional insight on her thought process won't make matters worse.

[He's already glancing around the bedroom just in case there's something small and thin he can use as a makeshift lockpick. If there isn't anything, though, he'll head back to the walk-in closet in order to continue his search.]

We will put it back where we found it once we're done. I promise.

[Throw all your morals to the ground. Read the diary, Yu.]