你说的带“极”字的有存在的理由（他们自己的理由）我可以理解，但什么叫他们存在是“必要的”？必要性在哪里？谁需要？极端msl就是现在全球都在说的恐怖分子，按您的说法，也必须存在，是吗？
I understand the raison d'être (their own) of the word "extreme," but what do they mean by "necessary"? Where is the necessity? Who needs it? The extreme msl is the terrorist that the world is talking about today, and, as you say, it must exist, right?