User blog comment:Asnow89/2015 Battle of the Fantasy Foods - Round FIVE/@comment-97.97.36.176-20150901180423/@comment-97.97.36.176-20150901191850

Because the gems on their homeworld are probably very greedy for power. I imagine this because the diamonds, the leaders of the gems, have made fusing, a power that makes gems stronger, a thing that is frowned upon. They may have ran out of resources on their planet and send ships to other planets to make more gems, and to keep the diamonds in command they have to be able to control the other gems. But all in all, my main reason for them doing the things they do, all the gems are greedy for power.