The sarcasm is actually a trick, not just sarcasm for sarcasm's sake.
I believe that if anybody tried to use the same type of sarcasm for my side, it wouldn't work.
It's the claimed belief vs real belief duality again. While I can write something like the above and everyone sees it's sarcasm (even if they disagree with me and think that I am evil for being sarcastic), my bet is that a NASPA (non-anti-Semitic peace activist) cannot write about Israel or Zionism using the same sarkasm because it simply wouldn't be so over the top and would actually make sense.
Think about things Israel does and what Israel's supporters claim about Israel:
1. Israel build a border fence (or wall, if you will).
2. Israel's supporters claim Israel wants to be secure from terrorism.
3. Israel builds a border fence to be secure from terrorism.
It doesn't sound very sarcastic. It makes sense.
In order to make such sarcasm seem sarcastic, my opponent would likely have to replace what Israel's supporters say with what Israel's opponent claim Israel's supporters say.
1. Israel build a border fence.
2. Israel's supporters want Israel to be Arab-free.
3. Israel builds a border fence to be Arab-free.
Again the sarcasm doesn't work. Instead we end up with a simple lie.
Whatever it is that Israel does, if you combine it it statements made by Israeli supporters it doesn't really result in something awfully funny or sarcastic.
The reason the result is sarcasm when you take what Israel's opponents say and do is because they are wrong.
Sarcasm is not only a cheap form of humour, it is also tool to be used like Ockham's Razor to find out whether a claim is true or false.
(Think of the terrorist who blows up a Jewish school in Jerusalem because he identified the school as the source of the oppression that he has a right to resist. Again mixing the action with its explanation sounds like sarcasm.)
