That flash is RIDICULOUS and full of plain wrong facts. The only legitimate parts are the (brief) part about settlement expansion and, possibly, the flechette part (but since more than half of the Palestinians killed during the Second Intifada have been militants, while THREE-QUARTERS of Israelis killed have been civilians, I don't think that the Israeli Defence Force should bear the brunt of criticism about avoiding civilian deaths).
Right off the top of my head I can tell you that al-Rantisi was not car-bombed in Damascus as the flash states, but killed by a Hellfire missile in Gaza. The creator was probably thinking of a much, much lower-echelon Hamas member killed a few days ago by the method he describes.
Calling the security fence "the apartheid wall" is about as inaccurate and disingenuous as a murderous individual like Bush referring to himself as "pro-life". Even referring to it as a "wall" is false (unless you're talking about specific sections). THREE PERCENT of the barrier can be described as a "wall". Most of it is a chain-link fence, which means that a fair assessment would probably refer to it as a "fence".
There are of course upsides and downsides, but I don't see why there's any need to blatantly lie about the effectiveness--shouldn't we be debating whether it's wrong or right without considering the effectiveness? This was in The New Republic, which is not a right-wing or pro-Israel magazine:
http://www.jewishworldreview.com/0904/halevi_israeli_victory.php3
Israel's triumph over the Palestinian attempt to unravel its society
is the result of a systematic assault on terrorism that emerged only
fitfully over the past four years. The fence, initially opposed by
the army and the government, has thwarted terrorist infiltration in
those areas where it has been completed. Border towns like Hadera and
Afula, which had experienced some of the worst attacks, have been
terror-free since the fence was completed in their areas.
I don't believe any terror attacks have been committed by crossers from Gaza at all since the fence was completed. Seriously, why lie?
To call the fence a "land grab" is also mistaken. Showing an image of one of the few concrete sections and asking "Does this look like a temporary barrier?" might convince the kind of people who bought the "Saddam has nerve-gas-filled jets ready to attack New York" mumbo-jumbo, but the rest of us know that the fence can easily be moved to wherever the final borders of Palestine are decided. (The real problem is moving settlements, which, unlike fences, are peoples' homes)
The opposition to the fence is based more on general anti-Israel feeling than fact, much in the same way that you might make fun of someone you hate for having a wart on their nose even while you wouldn't think twice about a friend's wart. It "looks like the Berlin Wall", so for the masses who don't think about things but just go by their gut, it IS the Berlin Wall.