How to compose a successful critical commentary:
- Attempt to re-express your target's position so clearly, vividly and fairly that your target says: "Thanks, I wish I'd thought of putting it that way."
- List any points of agreement (especially if they are not matters of general or widespread agreement).
- Mention anything you have learned from your target.
- Only then are you permitted to say so much as a word of rebuttal or criticism.