You are just going to state something that is blatantly false without any evidence or references? The nature of 51% attacks is pretty well known among the cryptocurrency community, and it's not hard to understand the technical aspects of it. You can't rewrite history because you don't have the private keys to the wallets you want to steal coins from. It's impossible. You can only affect transactions around the time of the attack.

https://en.bitcoin.it/wiki/Weaknesses#Attacker_has_a_lot_of_...

https://bitcoin.stackexchange.com/questions/658/what-can-an-...

"An attacker that controls more than 50% of the network's computing power can, for the time that he is in control, exclude and modify the ordering of transactions. This allows him to:

* Reverse transactions that he sends while he's in control Prevent some or all transactions from gaining any confirmations

* Prevent some or all other generators from getting any generations

The attacker can't:

* Reverse other people's transactions

* Prevent transactions from being sent at all (they'll show as 0/unconfirmed)

* Change the number of coins generated per block

* Create coins out of thin air

* Send coins that never belonged to him"