Wal-Mart has already issued an apology for this:
Walmart Issues Apology For Back-To-School Banner On Gun Display « CBS Chicago
This "gun" thread is henceforth being closed, as it has nothing to do with camping/RV'ing as per the site guidelines, and history has shown us these threads devolve quickly.
General discussions of politics, general government policies, weaponry, gun rights and religion are not allowed in ANY areas of the forum. Discussions about current or pending legislation or regulations, weapons and religion that
directly pertain to RVing are acceptable but will be closed or removed if they wander off topic or become disruptive.