The letter reads, in part:
"The depiction of a severely wounded soldier in this cartoon, regardless of the point Mr. Toles was trying to get across was not only just tasteless, it was hurtful. Hurtful to the many soldiers who have suffered from traumatic injuries in the fight for freedom, both in this current conflict, and in past conflicts. Hurtful to the families who have had to endure and care for their loved ones. Hurtful to the many citizens who have a passion for supporting and serving the heroes who fight for our nation."
[...]
"This show of ignorance only shows the disdain that Tom Toles and the Washington Post have for those who have taken it upon themselves to ensure our way of life. Perhaps if Mr. Toles was not writing in the comfort of his home protected by the freedoms guaranteed by our Constitution and protected by our military heroes, he would realize how important it is to cherish those who make it possible for us to enjoy the freedoms we hold so dear."
(Click the picture above to open the .pdf file)
If you don't have the Adobe Acrobat reader, get it for free here, or you can open the letter as a word document
I know this is going to be a shock, but apparently, unlike with other cartoons people find offensive, no one's burned down a building, attacked all the buildings on a street because they weren't sure which building was the office they wanted to burn down, shot anyone, kidnapped anyone, threatened attacks on a continent...it seems that one can express displeasure without all that.