If the ads said "You can be legally compelled to X, even if Y. Learn more about your airport rights at www.url.com" then it would be much less objectionable IMO.
I don't get why campaigns keep making this mistake. Take the freaking high road. Imagine the mind of your opposition, and accomodate the low-hanging complaints they're going to have. Craft a message that's maximally agreeable to the people who disagree, while maintaining accuracy.
Weasels on both sides here, IMO.