The Palestinians conducted negotiations while fomenting violence as a pressuring tactic. It backfired becuase the violence they fomented (suicide bombings) disgusted the rest of the world. They are using the same tactics but scaling down the violence to a simmer instead of a boil.
Report: U.S.-led strikes in Iraq, Syria killed 459 civilians (AP)
from the article: PA holds olive branch in one hand, stone in the other