why did lord krishna wanted the destruction of yaadava kula, why sri krishna let his own yadava dynasty to demise?

A) Because the 4^th yuga kaliyuga should be started according to kaaladharma, if yadavas the greatest ever dynasty if remained would not let the kaliyuga to start. Because if more sajjanas are alive the kali would not be permited to grow but kali yuga should grow as per kaaladharma. So, lord sri krishna thought of destroying the yadava dynasty so that kaliyuga may start without any hurdels.

 

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