Kaito was a kind-hearted young man and very earnest, and never really went about things in a way that would make most people get irate with him.

[ In his head he's trying to figure out a hypothetical situation here and who would have it out for Kaito, given the young man's nature. ]

Mm. The culprit possibly believing it was an act or that he was somehow hiding information seems truly the most likely here.