英语语法（斜体用法）Everyone I've talked to has a quite intense .

英语语法（斜体用法）Everyone I've talked to has a quite intense .
Everyone I've talked to has a quite intense and personal but often rather intolerant point of view about what we can——and can never never（斜体）——tell lies about.
译文：所有和我交谈过的人,对那些事情可以说谎,那些事情绝对不可以说谎都有着强烈的、常常不容他人分辨的个人看法.
请问：
1.这个句子语法上怎么分析?特别是破折号里面的.
2.这里的破折号是代表什么?
3.破折号里的第二个never为什么用斜体,