There is nothing to justify. The terms of the deal stipulate that Sony gets to co-brand their product with Destiny, and have exclusive rights to certain pieces of content in exchange for marketing services and cash exchange. If Microsoft had the same deal in place whereby certain pieces of DLC were exclusive to their platform would you be up in arms on behalf of Playstation owners? No. And I would be posting the same thing to the Playstation gamer who would undoubtedly be making a similar post to yours. Your job as a consumer is to be an educated one so that you make informed purchasing decisions. Don't throw cash at something and complain later because you didn't read the fine print.