At least they didn't do anything to Astro, the beloved family dog from the Jetsons. I just realized that with Sirius commonly being called the dog star, his name is actually a rather clever pun.

I have to agree with this post, dark magic is definitely at work. The rappist from that concert was reciting some kind of demonic-sounding incantation when people in the crowd started dying. It's pretty hard to ignore the satanic overtones in the entire set design of that festival. Held by a performer I've never heard even one word about prior to the incident. It was also game six of the World Series (lost by the Astros on their home field), and the dead singer was famous for a song called "Red Red Wine." Such wine is common in occult practices. It's all pretty on the nose in terms of symbolism.