I think you misunderstood my comment? I don't think it's useless. It's annoying and not perfect but airport security has improved safety of aviation by a lot in my opinion. The lack of any successful onboard attacks on aircrafts in the past decade (when other terror attacks happened frequently in Europe) are a good indicator for that.
ben gurion is widely acknowledged as being one of the most secure airports in the world. And they get by without all these stupid rules about shoes and liquids etc.