Is it ok to destroy the body, just because it is a "belonging"?

Verse 2.13: (Page 22 in notes): Krishna tells Arjuna that Bhīsma sarīra will go but Bhīsma Ātma will not go. So why are you grieving?

Few thoughts crossed my mind regarding this statement:

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1) In reply, Arjuna might as well say: "I don't even want to destroy the body of Bhishma".

(Body "belongs"to Bhishma (Atma). But we don't destroy "belongings" of others, especially of our dear ones, right? For example: I don't like to harm/destroy someone's "belongings" - like car, toy etc)

2) I am wondering what would have been Krishna's answer, if Arjuna said so.