I just got an idea...
We need to save all megucas, but they keep fighting and becoming witches.
So we create a giant mecha suit, and put the soul gems of all the megucas we can inside. That way they will be protected, won't wich out, will become another mind-hive and will be easier to clean.
In time, megucas will emerge again, but with the help of the mecha we will capture them with more ease and repeat the process.
The mechas will save megucas, and we will control the mechas.
This cycle will end the chaos and suffering of being meguca, and will be the solution to our problems.