Not all of them, but some of them were, because for the minority of unscrupulous ship owners, it can be easy to hide behind the anonymity offered by some flags of convenience.
不是所有的人，但是其中一些， 因为碰上了无良的肆无忌惮的船主， 很容易被隐藏起来， 借以“方便旗”的匿名性。