First, Paranoia means think toooooooooo much, and you won’t trust ANYONE. Well, Kino was acting paranoia, he’ll do anything to protect and hid the pearl. He tried to hid it in a secret place, but he felt that hiding it over there was not safe enough, so he hid it under his bed, and being a paranoia guy, thinking people will come and steal the pearl. And his “dream came true!!!”, people came to steal the pearl, and of course, Kino won, and those thieves lost, he was prepared that thieves will come, so he was awake when those bad guys came.
Being a guy that will think a lot and observe a lot is a great thing to do, but don’t be a paranoia person, it’s toooooooo over!!