If you had a gang member that had been indicted for murder, assaulting police, etc....would the police not go after him? It is stupid bravado and arrogant self-importance combined with the intoxication of power to say go and kill him which is I think where BHO is. That having been said, the police would go after a gang member as directed and attempt an arrest with some certain knowledge the perp is armed and dangerous. Outright assasination (sniping without door knocking, for instance) would be a violation except in mitigating circumstances like holding a hostage, etc.
The issue here is a failing nation. The Constitution is not going to protect us from evil men because the Constitution is only a dead piece of paper, not something to be worshipped. Men and women in law enforcement and/or military who honestly adhere to the Constitution may protect us; citizens may protect us or we may protect ourselves. When the system begins to rot from inside, as now, this is where we are. The issue here is bigger than thumping our chests about the Constitution about a particular case and how a dead piece of paper protects us when we've lost the foundations and morality that produced the Constitution...it's more about where are we on a broad level and what do we do from here?