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Ravana grabs Lakshmi like a rakshasa, and Duryodhana clings to Lakshmi like a yaksha, and Karna fights like an asura who feels tricked of what is rightfully is. Pandavas like Devas feel entitled. Only Ram and Krishna do not take Lakshmi for granted and work on dharma to make Lakshmi walk their way. That is why they are worshipped.