> I love how enthusiastic this post is while being wrong.

This is a very funny thing to say given that post is entirely correct, while you are wrong.

> Making a copy of a thing does not violate copyright

Yes it does, unless it's permitted under a designated copyright exemption by local law. For instance, you mention that the video player makes a copy from disk to memory, well that is explicitly permitted by Article 5(1) of the Copyright Directive 2001 in the EU as a use that is "temporary, transient or incidental and an integral and essential part of a technological process", as otherwise it would be illegal as by default, any action to copy is a breach of copyright. That's literally where the word comes from.

> If I own a license to listen to Metallica - Enter Sandman.m4a that I bought on iTunes and in the download folder I screw up and I make

> Metallica - Enter Sandman(1).m4a

> Metallica - Enter Sandman(2).m4a

> Metallica - Enter Sandman(3).m4a

In legal terms you do indeed owe him something, yes. It would probably be covered under the private copy exemptions in some EU territories, but only on the basis that blank media is taxed to pay rightsholders a royalty for these actions under the relevant collective management associations.