THAT is a great line of thinking!
No it is not. It is not a left vs right issue because you can find plenty of left wing viewpoints declining to criticize Bristol Palin and you can find plenty of rightwing viewpoints that are criticizing Bristol Palin.
So it is not an issue of Palin's pregnancy, it is an issue revolving around "moral superiority".
When you take the superior position or higher ground, you have a lot further to fall, if and when you fall.
Where-as Palin is the focal point because she is the one that fell, the finger is being pointed at all who consider themselves to be "morally superior".
Hypocrites talk the talk but don't walk the walk.