Shooting terrorists, now apparently inhumane

You probably saw this clip yesterday but if not, watch it and tell me what you think. Predictably, the Palestinians and their deranged sympathizers here in the US denounced the killing as inhumane. Of course being liberals, they said nothing about the terrorists' intent to slaughter innocent Israeli civilians, only whined about due process, civil liberties, and Geneva conventions. Apparently murdering Israeli civilians is fine but you're evil if you harm a Palestinian terrorist. My question is, was the killing of the terrorist justified? If you were the cop, would you have shot the guy?