IMHO, the bad nature of much of the UX we see around us is in the gray area between incompetence and malice. It's hard to sincerely concern oneself with usability when the main objective is to manufacture consent, manipulate the user into doing something you want, and use novelty or gamification to engage or convert. The poor design, flashy animations and other such cruft are a byproduct of this mentality - they may not always be inherently malicious in themselves but they are the result of a mindset which doesn't truly prioritize the user's interests.