The loyal Israeli citizens had planned to kill some Jews and kidnap others. To that end, they assembled a bomb and two firearms.
A Haifa court indicted the Arabs for abetting an enemy in wartime. Since their relationship with Palestinian terrorist organizations is hard to prove, the prosecution simply brought the strongest possible charges in order to get a plea bargain.
If Israel is at war and we know the enemy, what precludes us from bombing his towns?
Kahane was right!