"comports with the basic rules of law enforcement and the laws of war." Do you write drivel like this to wind the posters up? This is insane thinking.
If it was handled via law enforcement they'd have called the Intelligence service or the police in Pakistan.
The US took matters in their own hands as they had no confidence in Pakistan to do this right - that is if we actually believe they were prepared to take him alive if he did not resist. As ex POTUS Bush said - he was wanted DEAD or Alive.
Their actions are certainly not provided for in the laws of war, however the reality is that countries can and will act unilaterally like the USA did for their own, valid reasons despite the legality - just like they did here. More nations and people are cheering this than are upset.