A tip temperature at the end of the sparkler reaches 1800 degrees Fahrenheit and can easily cause a burn. Yes, people can die from fireworks and the fires they cause. That's a large improvement compared to 1902, when fireworks were legal in most states. In that year, fireworks and fireworks-related fires killed more than 200 people. The city of Phoenix explicitly prohibits the sale or use of any fireworks.
Some people smuggle fireworks into Arizona from other states or from Mexico.
It is strictly expressed that bringing fireworks into Arizona from other places is illegal and punishable by law. They take extensive precautions to ensure a safe, yet exciting show. Some people think that just because some fireworks are legal in some states, they are more safe. The largest share of fireworks injuries are caused by Class C fireworks, the kind that are legal in many states. Leave fireworks to the professionals.