Mike, I only wish it were true that such letters actually did get written AND make it through to the president. However, unless your readers are used to your brand of satire, a re-wording of actual letters publicly available about gun violence should not be presented in a column like this. Judging from some of the comments, some of your readers did "get it."
I would much rather conservative columnists use the truth -- or at least reveal their satire in some way that is obvious. What you have to say is important, so please do not defile the truth with untagged satire. A simple "what if" would have made the same point. As it is, you didn't even change the names of the children.