The perpetrator of this was another princess.
Both cases were done in the name of science, but the result? It was catastrophic. In the future, it may save more people depending on the use, but it also had huge potential to cause even more havoc.
The first one was clearly a mass murder weapon. As for the second one, it showed how much the government invested in learning how to control the populace.
As for the final case, it included a cult that had a huge following before it finally got banned by the government. This one didn't have any direct casualties, but it destroyed so many families.
Some lost all their savings, while many even got involved with debt. The result was a sequence of events filled with tragedy. This one was done by a prince.