Research Papers / On black death/bubonic plague: my research paper thesis [2]

Cool website. Anyhow, I am stumped with this 7 page research paper. You'd think after all these years I wouldn't have this much trouble but I kind of ruined myself with the topic I chose.

My topic is on black death/bubonic plague. My thesis states how the black plague was a better event for European society than it was worse. Is this even a thesis? I've been suggested to go off on overpopulation but I do not know where to look for sources for that kind of argument. So far I've written about 3 pages about the positive effects of the plague but I don't really feel like I am arguing anything.

Anyone help me out??

Thanks