Pretty easy to explain. Israelis, just like other people read HN too. They don't like such articles, so they flag them. If an article receives several flags, it's marked as flagged.
Also, HN is tech site, not political site, so I'm not surprised by this, such articles may be considered off-topic.
Also, HN is tech site, not political site, so I'm not surprised by this, such articles may be considered off-topic.