There's some excellent food for thought about `no first strike in Karate' (with evidence from his own writing that Funakoshi had no problems with preemptive striking as part of Karate's overall strategic plan) here and here. Both articles are part of the free downloadable set on Iain Abernethy's almost unbelievably good web site; Abernethy wrote the first essay, and one of his guest writers the second. Together they add a lot of historical perspective and ethical depth to the issue.