This card is issued after a background check *and* interview are conducted both by Homeland Security and the Canadian Border Service. They make it clear that the card can be,and will be,revoked for the slightest "infraction". Forgetting to report that you're bringing an apple across the border for example.
If Homeland Security ever discovers that I voted for Trump,contributed to his campaign,attended three of his rallies and...GASP...want to know who killed Ashli Babbitt I can surely kiss that card goodbye.
And I'll probably wind up in a dark cell somewhere as well.
That crossed my mind as well. Fortunately I just got my card renewed so I’m safe for a while...
Don’t despair, after all things went pretty well for Edmund Dantes in the long run.