modeta sādhur api vṛścika-sarpa-hatyā
lokāś ca nirvṛtim itāḥ pratiyanti sarve
rūpaṁ nṛsiṁha vibhayāya janāḥ smaranti
The most important point in this verse is that although saintly persons never desire the killing of any living entity, they take pleasure in the killing of envious living entities like snakes and scorpions. Hiraṇyakaśipu was killed because he was worse than a snake or a scorpion, and therefore everyone was happy. Now there was no need for the Lord to be angry. The devotees can always remember the form of Nṛsiṁhadeva when they are in danger, and therefore the appearance of Nṛsiṁhadeva was not at all inauspicious. The Lord’s appearance is always worshipable and auspicious for all sane persons and devotees.