Gavriel recommends new tactics for the IDF that comply with "proportionality". I do agree with those who say that Israel uses disproportionate force but not in the exact way they mean it. I think Israel uses too little force. I don't think another Western country -- oh, let's say the United States* -- would react in the same manner. Just look at the past four years. After 9/11, the US has utterly destroyed two tyrannical regimes and she is likely not going to stop there.
* Yeah, I know it's an unfair comparison since Israel is tiny relative to the US and surrounded by enemies. Though, in my limited opinion, the tactic of targeted killings of Islamist-terrorists should not be paused.