I never said that I supported building any of the walls in the example. I was simply saying that I understand the desire to build the the Mexico and Palestine walls.
To answer your question, the reasons for walls are pretty simple. It's to keep undesirable people out.
Of course, you already knew that. You want me to defend these walls as the best way to prevent terrorism in Israel and prevent illegal immigrants from flooding into the US. I'm not convinced they are the best way, so I won't be arguing that point with you.
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