You cant be blind to this, Piracy is different from stealing, but it is analogous and so the meme.
When you physically steal something from a store, the store faces a loss of value and that is why it is illegal.
Information is not valued in the same way as other goods and sometimes the value is lost when a copy is made even though the original is not damaged in any way. Its like the secret treasure map which has the value of the treasure if its a secret and has zero value once its made public and the treasure is long gone.
> sometimes the value is lost when a copy is made even though the original is not damaged in any way.
The one and only time this is true is when something is pirated pre-release, thereby causing an actual financial impact to the rightful owner. You'll also find that there are court cases backing this line of reasoning up.