There is no way for the software to automatically know if one chain is better than another except by the greatest proof-of-work. In the design it was necessary for it to switch to a longer chain no matter how far back it has to go.

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One winner. Completely ignores *who should win*

Chain with the most work is king, even if cheaters *slipped in* a double-spend

Generals had to have consensus on one thing before the headed off to their bunkers: message with the most work is the truth, that is it.