|Robert Downey Jr. as Tony Stark/Iron Man|
|Tony Stark (RDJ) left, facing down his other Iron Man suit|
|Hammer Industry Drones from Iron Man 2|
Hammer Industries is ultimately thwarted and their drones are destroyed, partially due to their use in the vengeful plots of Ivan Vanko, but they are not the only reproductions of Tony Stark's Iron Man armor. In the first film, Tony Stark's greedy former friend and mentor Obadiah Stane creates his own, gargantuan, slightly flawed, version of Tony's armor. Also, following the failure of the Hammer drones to kill Tony, Ivan Vanko reveals his own armored suit based on Iron Man. Both are eventually destroyed in crippling combat with Iron Man (and for the latter, also War Machine), but the threat that someone will use Iron Man's technology for evil still exists, and is shown to be very real.
In Iron Man 3, the anonymity of the Iron Man suit is taken advantage of as War Machine, renamed Iron Patriot for PR reasons, is taken captive and his suit is used for nefarious schemes. Hidden behind the mask of a hero, villains are able to get into secure places and use the technology to their own evil ends. More people use Iron Man suits for evil and twist Tony's designs to create something that can face down evil and warring aggressors. It is in this context that the destruction of his Iron Man armors makes sense.
While the destruction of Tony's many suits in the end of the film show his release of fear, his need to be in control and security based upon his creations, it does go well with earlier character development. In the wake of the Avengers, Tony Stark retreats in fear to building an Iron Man army, coping and releasing energy by tinkering and constructing.
|Stark's Legion of Iron Man armors in Iron Man 3|