You're claiming that the American left has no issue with the term "thin blue line" or its context because that term is accepted by the mainstream. I provided links to demonstrate the contrary, illustrative of the fact that the American left does in fact have an issue with the term and its context, and that the mainstream of American politics and media does not represent the actual culture of American leftism.

Also the Noveau kernel is as far as I understand a FOSS project. There are no "jobs" from which one can be "fired."