For those of us who live in the Midwest, or in the South, Carls Jr = Hardee’s. The parent company of Carl’s Jr. bought Hardee’s a few years ago, which is when we first noticed the new logo of the yellow star with the smiley face.
These ads have been running for awhile, and attracted some controversy. I don’t think a single letter will deter them at this point, assuming that the ads are increasing business. Organizing a letter campaign with the realistic threat of a boycott would be necessary. And even then, it would probably have to show that guys 16-26 y.o (a key demographic for this chain) would be less likely to eat there.
On the other hand, the company which owns Carl’s Jr. and Hardee’s has just been sold.
newsobserver.com/2010/02/27/360790/boston-company-ready-to-acquire.html
Perhaps the change at the top will mean the company is more willing to change direction. The news article also mentions that a large chain of Hardee’s franchises refused to run one set of ads which it considered in bad taste. So perhaps targeting regionally is a workable idea.