Israelis all serve in the IDF, making them all valid targets. The only ones that don’t, are far right zealots that shout for other Israelis to commit geonicide. Many of them are also settlers who engage in horrendous pogroms, supported by the state, IDF, and populace at large. Finally, the oppressed owe their oppressors no quarter and are not required to play respectability games or pass purity tests. They can’t afford to, their very futures depend on it.