your interpretation,
Jason Rai, is very interesting.
only - i know of no poem by Buk, where he talks as "I" and does
not really mean himself.
so the "I" in the poem would rather be him than society, which makes the flies Not him.
BUT - in the last lines he shows, that there IS something similar between him and the remaining fly. a tie that binds. ("woven together") and that he came aware of it only because he killed the other fly which changed the whole situation.
i can see
hanksolos point:
Have you ever been in a room with a couple of flies? Try to imagine what that's like for a moment...
i can imagine Buk sitting at the typer, trying to write, being disturbed by these two flies (literally) and unable to concentrate on anything else.
so, he starts to write about the flies. the whole 2 / 3rd of the poem comes like a simple description of what really happens. no deeper meenings, i'd say. except being seriously nerved by these tiny suckers.
then suddenly, after killing one, things change and he (the "I"-person) realizes that (as well as the remaining fly does). and even though he still describes in a natural way, it has become something spiritual.
i'd say the two major quotes to show these two 'parts' of the poem are:
"other men suffer dictates of empire, tragic love ... I suffer insects."
(this, to me, has something like: "It's not the big things that send a man to a madhouse...")
and then:
"we are woven together in the air and the living; it is late for both of us."
(that last sentence could refer to the "I"-persons late insight, for which one living creature had to die first, as well as he and the fly are 'late in life' meaning 'closer to death than to birth'.)
or maybe i'm wrong.