Mike,
If you are OK with some innocents getting killed occasionally by law enforcement, then what is the difference with some innocent people being denied a firearm because they somehow end up on a terrorist watch list as both occur out of a necessary law enforcement function.
I didn't say I was OK with it. I was saying in a nation of 330,000,000 people there are going to be some citizens shot by policemen when they shouldn't have been shot. The policeman may have been negligent, he may have made a simple mistake in judgement, he may have been inexperienced. But it is going to happen.
If the central government can simnply put citizens on a list without due process or judge or jury and then deprive them of their Second Amendment rights they can also deprive of them of their entire Bill of Rights.