① I’ve been teaching college students on and off for 25 years. Over the last few years, students have become much less willing to argue with one another in class. They don’t want to be viciously judged. It’s not even that they are consciously afraid of being canceled. It’s simply that the norm of non-argumentativeness in public has settled over many (but not all) parts of campus culture.

曹老师您好，我想请教下，这里的"afraid of being canceled"怎么理解，为什么是“被取消”？

②Friendly warnings didn't change our planning, although we might have more prudently checked with the U.S. State Department's list of trouble spots.

老师这里的"might have checked"如何理解？

这里用"although"连接，和前面的逻辑关系不是很明白。

③No guides were available so it was do-it-yourself, using our guidebook, which cheated us of a lot of interesting history and anecdotes that a professional guide could provide.

老师这里的"could"是理解为情态动词表推测→“可能”嘛？

万分期待曹老师的回复，万分感谢！！！