The righteousness of Maran Ha-Rav Kook and our Rabbi, Ha-Rav Tzvi Yehudah

Question: There is the famous story that Maran Ha-Rav Kook admonished Reb Aryeh Levin because he picked a leaf off a tree while they were walking. He said: "Every blade of grass says something, every stone whispers a secret, every creature sings a story" (Malachim Kivnei Adam, p. 239-240). And I saw in Ha-Rav's book "Rabbenu" (p. 61) about our Rabbi, Ha-Rav Tzvi Yehudah, that at the end of our Rabbi's class on Maran Ha-Rav Kook's commentary on the siddur, "Olat Re'eiyah," some students entered to talk to him about an important matter. He motioned to them not to say anything and that they should sit next to him on the couch. The students were surprised by the need for silence since nobody was in house. Our Rabbi also sat silently and left his book open. After a while, he said with a wonderful smile: "He has desired it for His dwelling" and he repeated: "He has desired it for His dwelling" (Tehillim 132:13). The students assumed that this was what out Rabbi was teaching from "Olat Re'eiyah." He smiled again and said: "He has desired it for His dwelling" and pointed at the book. The students looked closely and saw a moth on the book. Our Rabbi did not want the students to scare it, he therefore told them to enter quietly. After a few minutes, the moth flew away on its own. Our Rabbi closed the book and began to talk. Are we also required to act with such sensitivity to plants and insects? After all, there does not seem to be an issue of "tza'ar ba'alei chaim" (cruelty to animals) here? And regarding the story of our Rabbi: doesn't the concern of "Bitul Torah" (taking away from Torah learning) override such an act of righteousness?Answer: These are truly acts of righteousness and a person is not obligated in them. Each person should act according to his ability and spiritual level. There is obviously a difference between these two stories. In the story of Reb Aryeh, there was no reason to pick the leaf. Why should a person pluck a leaf off a tree for no reason? In the second story, there was a reason: Not to scare the moth. Acting in this way is a personal decision. Regardless, this is not "Bitul Torah" since fulfilling the Torah is not "Bitul Torah."