if you know my political trajectory, the projects i'm involved in, and my specific socio-political theories, you'll know that i do not reject infighting. i find it a valuable tool for honing my outlook; forcing me to rethink/rearticulate particular positions. making distinctions where distinctions belong is the best result of what others derisively label infighting.
the issue of sectarianism is more tricky. if you reread my editorial in ajoda #66 ("on sectarianism") you'll see how i make a distinction between being partisan and being sectarian. but then, you didn't like it when you first read it, so i guess it won't matter much more today.
by having arguments and discussions (heated or calm) we discover our actual affinities and distinctions, and such a process can only help us find allies, quasi-allies, competitors, rivals, and actual enemies (although that's rare -- i would still defend some of the NEFAC and/or AK Press folks if they were facing something nasty at the hands of the state).
i'm willing to go so far as to say that infighting is beneficial.