User blog comment:MarineroLelouch/Power Ranking and Classes./@comment-92.96.32.189-20140215151525/@comment-4829046-20140215184604

The way I hypothesize, killing a Dragon is how you get the lacrima so it would make sense for the parents dragons to tell them to kill and take the lacrima for themselves in order to get stronger and one day save the world from apocalypse.