I always assumed they were planning to
eat Our Heroes until Luke gulled them into believing Threepio was a god.
ETA: Here's an even less equivocal defense of the Ewoks:
http://www.alltooflat.com/about/personal/sean/2009/04/lost_thoughts_9.html"The Ewoks are awesome. They look like teddy bears and fight like the Viet Cong. If given the choice between living among humans for the rest of my life and living among Ewoks, the choice would be it's not even a choice. Ewoks every time. What I'm saying is that the Ewoks are better than you."