I'm not saying the Clintons haven't crossed the line before. I think they have, and that's how they lost my support. But no good can come of blaming them for this situation.
The fact is that the Wright thing would have popped up eventually, and this is really the best possible time. If it had hit earlier, it might have severely hurt Obama in the primaries. If it had hit later, it would have hurt him for the general election. As it stands, it hit in the biggest lull in the primary schedule--after he has the nomination cinched on delegates. And it's a month out from a contest that he was expected to lose anyway. This gives his campaign enough time to do damage control while inoculating against this in the general. Finally, he capped the week off with a major endorsement coup that's totally changed the media narrative.
The timing and expert handling of this situation turned it into a blessing in disguise. So, lets not dwell on unfounded accusations when we need to heal the party wounds and get our candidate elected in November.