Here are some example phrases that are in bad form:
"Because we hate spam as much as you do!"
"We hate spam as much as you do! We never sell or disclose your name or e-mail address to third parties. For more information, please see our privacy policy."
Why is this bad form?
Whatever you are FOR;
Strengthens YOU.
Whatever you are AGAINST;
Weakens YOU.
"Hating Spam" puts you against something. Being for privacy protection strengthens your position.