The issue here is not about the affiliation of a person; but about the actual involvement in the hostilities. Persons who are involved in the hostilities are 'combatants' and should make legitimate targets, regardless of the reason d'itre of the war. Those who do not take part must not be targeted. It is not important if a person is Fatah, Hamas, Likud or Labor. The question is whether the person was a legitimate tartegt of a military attack or not. With this distinction, only around 15% of the casualties of the war were combatants. Otherwise, it should be legitimate to question the identity of Israeli civilian casualties and chec if they were affiliated with political parties. Those who have affiliations would, under this interpretation, make up legitimate targets for military attacks, which is a very dangerous notion to accept. Non-combatants must be protected during war. End of story.
ISIS claims responsibility for car bomb that killed four in Sana'a, Yemen (Reuters)
from the article: Hamas admits 600-700 of its men were killed in Cast Lead