I interpret the OP as thus:
**“Can I get a real cool gun and be shown on TV attacking bad people, now that TV is showing such things, and thus be the coolest part of this very popular, violent action, which may or may not be justified depending on your viewpoint, but which is obviously where all the attention and action is, and then quit when TV starts showing something else?” **
As answered above, no you can’t. Neither can you volunteer for the Red Cross for only the duration of a high-profile earthquake/flood/drought/hurricane relief program, be guaranteed a high-profile spot on the frontlines, and then quit once the cameras go away. Neither can you volunteer for EPA cleanup efforts during a high-profile oil-spill, and be guaranteed to be washing oil off the extra-cute seals only. Neither can you volunteer to be a firefighter only during high-profile fires, or be a cop only during high-profile manhunts.
You’re either dedicated to the cause or you’re not. You either commit your life to the mostly thankless, mostly invisible, occasionally miserable, often low-paid career of defending your country, saving the environment, assisting the needy, extinguishing fires, or enforcing law–or you don’t.
Of course, you can still donate money, blood, weekend time to smaller projects. You can be in the reserves, or sponsor a child, or mentor a kid at risk. You can join a neighborhood watch. But since the cameras and attention won’t follow, somehow I doubt you will.
(Not that I will, either. Needles and guns both give me the willies…)