My only question is why would you call this "the culmination" of anything? For the last quarter-century there's been a fairly steady stream of intimidation, harassment and violence directed at abortion providers. True, assassination murders have been rare compared to, say deaths in traffic (but not compared to Muslim-originated terror attacks in the US) but Tiller himself was the subject of a half dozen physical and vandalism attacks since the last abortion doctor assassination murder. The killing is a tragedy, but entirely within the normal range of operations for the movement which has been pushing against reproductive rights for the last 25 years or more.
This isn't an "end" or "peak" in any meaningful sense, unless there is some kind of political and cultural shift which actually pushes these radicals out of the mainstream.
To clarify, I'm quite sure that the anti-rights movement is going to move on to another target, which will inevitably "culminate" similarly, then another, and another....
For more, I recommend Sara Robinson and Digby. Meanwhile, over at Terry's I said
You know what I just realized?
Operation Rescue had an immediate statement ready, with just the right mix of violence-rejection to cover their asses and not-backing-down-abortion-is-murder brimstone to let us weak-kneed liberals know that they aren’t going to let some negative attention shift their rhetoric or tactics. They knew something like this was going to happen, and they don’t care.