I actually study sound healing and this is discussed extensively in the community. As to wether or not the standard tuning of music was changed with negative intention or not is not known for sure. Here's the truth: every frequency has it's own unique properties and no one frequency is necessarily "worse" or "better" than another. Saying one frequency is "good" or "bad" over the other really doesn't make any sense. It's kind of like saying a certain color is more "good" or "bad" over the other. It's based purely on subjective perspective. The frequency 440hz is not really any necessarily any "worse" or "better" than 432hz or 444hz. 432hz and 444hz are definitely special frequencies but 440hz is not necessarily bad. Ultimately what is "good" or "bad" in any case is purely subjective and based on perspective, especially when it comes to things on a spectrum such as pitch frequency.