Here's a chain of reasoning we see often today:
1) Famous pundit/politician A is against the Iraq War but was/is for intervention in Bosnia/Kosovo/Darfur.
2) This is inconsistent. (Let us grant 2 for argument's sake.)
3) Therefore, the case against the Iraq War is nonsense.
See how 3) follows of necessity from 2)?
What?! You don't? You must be a "Jew hater"!