At the heart of liberty is the right to define one's own concept of existence, of meaning, of the universe, and of the mystery of human life. Beliefs about these matters could not define the attributes of personhood were they formed under compulsion of the State. ~Planned Parenthood v CaseyI believe that I've written explicitly enough that the killing of George Tiller was murder, and that it was both evil and foolish for Roeder to do so. That being said, let us reason together.
The quote above is, as stated, from the decision in the Supreme Court case Planned Parenthood v Casey. That means, at least insofar as the present day workings of the legal system of these United States goes, that the quoted position is to be taken as a basic principle contained in and protected by the Constitution of the United States. Now assume the following: Roeder defines human life in such a way that abortionists are not included under it, or at least under the category of human life whereby one is protected by a right to not be killed. Or assume Roeder defines the universe in such a way that it is a moral imperative for abortionists to be killed because of what they do. Or assume both, or any similar type of position, or every similar type of position.
Under such an assumption, how can Roeder be prosecuted for murder? He has a basic Constitutional right to define these things for himself, and to do so without any compulsion from the State. That compulsion obviously includes using laws against his position to punish him. This is the same logic that says abortion must be legal, else we would we using "compulsion" to define things like life for people and thus denying them their liberty. If Roeder holds any position similar to the ones given above, then he should be immune from prosecution under the Constitution of the United States as authoritatively interpreted by the United States' Supreme Court.
In other words, the logic of modernity and basic consistency demand that Roeder be free from prosecution by the State. If they were truly consistent, then pro-aborts would be decrying Tiller's murder, but at the same time they would be decrying any attempt to prosecute Roeder. They would admit that they do not like the murder of abortionists. But the answer to that is simple: if you don't like abortionists being murdered, then don't murder one. They would reach across the aisle, extending hands of peace and cooperation, so that both pro-lifers and pro-aborts could work together to make the murder of abortionists safe, legal and rare.
This is what logic would demand. Moderns love to claim the mantle of logic and reason. Let us see if any actually follow their first principles were logic leads.