why yadavas they themselves killed each other why not other than yadavas r included in the destruction of the yadavas?

A) PEOPLE who are devoted to lord sri krishna won't be embarrassed or defeated by others who are not the bhaktas of lord krishna.
As yadavas are the greatest bhaktas of lord sri krishna they won't be in a position in which they are degraded by other non bhaktas, hence yadavas were killed by themselves by fighting with each other.
नैवान्यतः परिभवोऽस्य भवेत् कथञ्चित्
मत्संश्रयस्य विभवोन्नहनस्य नित्यम् ।
अन्तः कलिं यदुकुलस्य विधाय वेणु
सङ्घस्य वह्निमिव शान्तिमुपैमि धाम।। (भागवतम्)
नरसिंहाचार्य सुळिभावि
मठाधिकारि,
गुंटूर, उत्तरादिमठम्
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