Подскажите, пожалуйста, как в данном случае переводится
high-water mark of America`s zealous security culture?

The case of Private Bradley Manning, convicted this week by a miliraty court of leaking secrets to the WikiLeaks website and now facing up to 136 years in jail, looks as if it might be the high-water mark of America`s zealous security culture. It certainly ought to be. After the attacks of September 11th 2001, George Bush tipped the balance too far from liverty towards security, and it has stayed there under Barack Obama.

Спасибо!

(Фраза "It certainly ought to be" предполагает, что дальше уже некуда).