Thank you Great A.
Reading through that, it does very strongly suggest that a wall is effective at stopping certain types of activity. This makes me wonder a few things.
For the people who are against the wall, why do you think that the wall will prove ineffective, whereas it seems like the Israeli wall is proving effective? Is the effectiveness skewed/false in some way, or is there some other mitigating factor?
For the people who are for the wall, do you think the fact that Israel faces a different type of problem, in comparison to the U.S., might change the effectiveness of the barrier? Could the small scale and relatively tight population, paired with an extremely active Israeli military make the wall effective in a way that a very long U.S. border wall won't be? Could it defending against illegal immigrants wanting to vanish into the population versus terrorists wanting to hurt people change the effectiveness of said wall?
In short - why do you think a wall will work, or won't work, given that Israel's wall seems to stop certain type of activity?