PURPORT

The Lord is impartial in every respects but still He is inclined towards His devotees because there is great necessity of this for everyone's well being. The Pandava family is the marked family of devotees and therefore the Lord wanted such devoted family must rule over the world. That was the reason that He vanquished the rule of the company of Duryodhana and established the rule of Moharaj Judhisthir. And as such He wanted to protect Moharaj Parikshit also who was lying in embryo. He did not like the idea that the world should be without the Pandavas the ideal family of devotees.