"A lot of luxury goods brands destroy their unsold merchandise"
This also happens since probably forever with fruit and vegetables if they're unsold or in overproduction. The reason is to keep prices fixed by artificially reducing the offer.
Fruit and vegetables and other perishable goods will effectively self-destruct if unsold anyway, so I don't see that as being quite as bad as deliberate destruction of product that would otherwise last indefinitely.
And if one's looking for the reason why so many people complain about the market economy, that's one reason. This is all economically sound, but beyond that, utterly fucked up.