But whether all miners get together and carry out a 51% attack or all validators get together for a 51% attack is basically the same, it is possible with both
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Maybe it's just a matter of faith like religion, some believe in Bitcoin, others in Ethereum and some in both or neither
Let's assume if someone wants to execute 51% attack over bitcoin network then they approximately need 181 EH/s of hashing power it is equivalent to hash power produced by 1 Million powerful ASICs so imagine it will need around 10B dollars for the product cost alone and then the operating cost which will be like another 5B and they have to keep running the ASICs to keep their control over bitcoin network, once they stopped all the blocks reversed will be confirmed again so its like they just wasted billions to hold the network for a while so its like they need unlimited amount of money to take control of bitcoin forever.
If it is executed on the Ethereum network then the attacker needs 10M ETHs staked which is around 20B and if once the attacks start then a voting process needs to be taken to reverse those validated blocks (correct me if I am wrong guys).
Bitcoiner2023 so both are decentralized however you can differentiate which one is impossible to attack than the other.