1. B'tselem lied about not knowing whether 248 police officers killed by the IDF in 2008 were combatants. Hamas admitted they were in 2010 and yet B'tselem just updated their page 2 days ago, still claiming they don't know. Yeah, right. They've known better for 6 years. So that's an outright lie by B'tselem and you know it.
B'tselem never lies? 
Please.
2. No one is assuming civilians are combatants. Militants are combatants. Militants are not civilians. The way you wish to interpret IHL is to give folks like Osama bin Laden the benefit of the doubt. He was a militant, uniformed or not. When the US killed him, he was not a civilian. Thus, no war crime. Same as Israel taking out Hamas militants. Osama wasn't even carrying out a continuous combat function. Didn't matter though, you know why? Because he wasn't a civilian. No war crime committed. Think about that one. If taking out Osama was legal, then Israel taking out Hamasniks is legal too. You lose this one, utterly.
ETA
Even assuming the Osama bin Laden killing was illegal, no one claims he was an innocent civilian. He wouldn't count as a civilian in any civilian to combatant kill ratio. Same WRT Hamas militants. The police and world cup dudes don't count as civilians. Take all these bogus "civilians" out of the picture and Israel's ratio of civilians to combatants killed really is around 1:1, which is the best ratio of any western military or NATO, proving once again Israel is more careful WRT civilians than any other country. That's why the leading military American General admitted it recently himself, giving Israel credit and acknowledging that America is learning from Israel how to better protect civilians.
Stop demonizing Israel as though they're the worst WRT civilians when it turns out they're the best. When you portray it backwards - deliberately - that's just hatred, pure and simple. Maligning a group of people for crimes they do not commit is the definition of bigotry.
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