One of the most powerful properties of a blockchain is the fact that every single part of the blockchain's execution can be independently validated. Even if a great majority of a blockchain's miners (or validators in PoS) get taken over by an attacker, if that attacker tries to push through invalid blocks, the network will simply reject them. Even those users that were not verifying blocks at that time can be (potentially automatically) warned by those who were, at which point they can check that the attacker's chain is invalid, and automatically reject it and coordinate on accepting a chain that follows the rules.
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