The best method of operation for a social justice group which wishes to find optimal conclusions may be to hold off on proposing solutions.

Mmm, my gut response is thinking that there are not a lot of solved social issues so this wouldn't be very useful for a social justice group that actually wanted to get things done? The UUs have been fairly politically active in spreading their values for a while, and I haven't seen any evidence that their politics is particularly ineffective for their values.