So, I guess I get your point of trying to sell a high end vehicle right now may not be the most appropriate thing right now, but they are not the only company doing it.
Then, lets take it a step further and follow your train of thought, fire the actors, GMC does not run the add, sells less trucks, closes dealers, which also trickles down to vendors who rely on the dealerships for their income, and the manufactures who supply GMC with parts, could also go into the lost jobs of the people who make the commercials, and so on.
How does your idea help, but rather contribute the already growing problem, if you do not like the commercial, change the channel.
Every action has a reaction, nothing is simple in our lives now.