I saw the ad yesterday. I was not a fan of the USAPA deal when voted in, and I am still unsure of how that will work - I say this to let you know that I am generally pro-ALPA and anti-USAPA.
That said, I loved the ad by USAPA. What the ad did was reinsert the role of "Captain" and introduce the term "Captain's Authority" to the general public. I have thought for a long time that ALPA has not done enough "PR" work on behalf of the pilots. Whether the ad was true or not, or whether the pilots are justified or not is secondary to the fact that their union is taking out full-page ads saying (to paraphrase) "management simply wants to save fuel, blah blah blah...but we the airline pilots care about you and your safety and we have superior judgement". This is an exceptional message for the public to have.