the PLO gives the last word about anything related to the palestinians. Abu Maze need to follow what the PLO asks him to do. In fact, is there is something that both PA and Hamas agree, is that the PLO have the real power in Palestine. You can claim about the occupation and such, but once backing this decision of the PLO, you backing what you bash so intenselly.
Firebomb thrown during demonstration in northern Israeli town of Umm al Fahm (Haaretz)
from the article: PLO official: Palestinians, Israelis must be totally separated