Subject: Re: [Bitcoin-development] Double-spending unconfirmed transactions is a lot easier than most people realise

From: Matt Whitlock <[email-masked]>
Date: Wed, 23 Apr 2014 00:03:17 -0400

On Tuesday, 22 April 2014, at 8:45 pm, Tom Harding wrote:
> A network where transaction submitters consider their (final) 
> transactions to be unchangeable the moment they are transmitted, and 
> where the network's goal is to confirm only transactions all of whose 
> UTXO's have not yet been seen in a final transaction's input, has a 
> chance to be such a network.

Respectfully, this is not the goal of miners. The goal of miners is to maximize profits. Always will be. If they can do that by enabling replace-by-fee (and they can), then they will. Altruism does not factor into business.