Indeed it has. Differently to the way it is happening now.
However, this is outrageous. Death threats? Please. I, too, would turn these over to the police. Whoever is responsible should be punished severely.
It reminds me a little of the activists and extremists who bomb abortion clinics. Sure, they may not agree with abortion - many don't - but isn't it about a right to life? How, then, does that equate with murdering doctors, nurses, administration personnel and patients?
People are entitled to their views, and entitled to disagree with mainstream science, or the government, or abortion, or euthanasia, or the war in Iraq, or anything else they want to disagree with, without fear of being killed for it.