Why does the burden of proof lie on the claimer?

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Because realistically, if it were up to the defendant to prove he didn’t do whatever the claimant claimed he did, then that would make for a field day for everyone who has an imagined grievance. I could sue you for killing my dog and it would be up to you to prove that I never even owned a dog, upon pain of a court judgment granting me damages for something you never did to me.