I was just using Rambo as my example, he of course isn't the only example- there is also, Judge Dredd, Rocky, Keanu Reeves, and a wide array of Austrian Strongmen.
Regardless, the point wasn't necessarily that all heroes should be rambo style action heroes, but that they should be awesome, like Rambo. The whole point of brikwars (if there is any point of brikwars) is violence. A hero, in most cases should be someone who is either adept at violence, awesomely violent, or violently awesome, with preference given to those who are all three at once. Yes, you "could" have a clown as a hero, but a hero who juggles bricks, and makes balloon animals would be extremely lame, and there is nothing worse in a brikwar than lame. Now, if said clown was juggling the decapitated heads of his enemies, and making balloon animals out of the intestines of his eviscerated foes, it would be an entirely different ballgame.
There is a special place for those figs in brikwars whose skillsets do not revolve around either violence, or the propagation of violence, and that place just happens to be impaled by their own non-violence protest sign, stuck to the warhead of a doomsday rocket, and subsequently, in several bloody chunks strewn across the battlefield. That's the thing about pacifists, civilians, and non-violentists- they either die a bystander, or live to see themselves become a hero, in deservingly violent fashion.