I think this is still too logical to work. Each step of an argument is another place that can be attacked. And because attacks are allowed to be illogical, even the most logical step has maybe 50% chance of breaking the chain. The shortest, and therefore the most powerful argument, is simply "X offends me!" (But to use this argument, you must belong to a group whose feelings are included in the social justice utility function.)
Now that I think about it, this probably explains why in this kind of debates you never get an explanation, only an angry "It's not my job to educate you!" when you ask about something. Using arguments and explanations is a losing strategy. (Also, it is what the bad guys do. You don't want to be pattern-matched to them.) Which is why people skilled in playing the game never provide explanations.
I hope your rationalist toucan is signed up for cryonics. :P
I'm sure it depends on where you hang out, but I've seen plenty of explanations from social justice people. A sample
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one.
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.