I'll assume the two stakeholder groups referred to are travellers and CBSA.

I believe they should let the advocacy and informative message run.

The message is sensational, but no more so than any other ad with an agenda (i.e. all of them) and many travellers through YVR (Canadian or otherwise) would benefit from considering what they may be compelled to share, without warrant or regular safeguards, with CBSA.

And if CBSA wants to run a sensational, informative, and fear-based campaign of their own, let them. (As if they already aren't.)