Yes Palestine can join the ICC but it will not launch criminal complaints against important Israelis because this would leave them vulnerable to having many of their own top brass arrested as well. Terrorism, if you don't know, is actually a war crime. Israelis do not become guilty of "war crimes" simply because of their status as "settlers." The act of transferring the population of a state to its occupied territories is illegal, but that does not make the people sent criminals and certainly does not mean they committed any "war crime." I wonder if you even know what the term means.
Police disperse hundreds in brawl in Kafr Manda, northern Israel (Haaretz)
from the article: Abbas predicts 'very difficult' time for Palestinians after UN bid