You should be aware Dr. Dan that Rabbi Meir Kahane does not limit the law of the 7 nations of Canaan to a certain genetic group (some of our great Rabbis limit the law to a certain genetic group, while I believe the majority do not). Rabbi Kahane believed for example that the Arabs of the land of Israel had Canaanite Status, regardless of who their genetic ancestors were.
In any case, if you believe that morally or pragmatically we would not be able to take any measures to gain control of the entire Nile to Euphrates region, while the peaceful Kurds are occupying the land this would be one of the reasons, why it might be better not to arm the Kurds, so that a more recognized enemy rules the territory, where good Jews would be feel more comfortable in taking away the land from them and removing the enemy.
You still could argue, that Israel is having trouble even handling one tiny enemy, the Hamas in Gaza and its asking too much of the current failed leadership to deal properly with an ISIS takeover in Iraq, so it is better to bog Iraq down in a civil war with well armed Kurds, so that Hamas won't have a strong ally.