And it's not just movies. You see it in many major video games too. Take Mass Effect for example; You could play as the most loving, all-tolerating paragon character in that game but in the end there are baddies that you have to shoot, not love/tolerate.
For example, gun ranges usually have Desert Eagle for rent, but not S&W M&P. In real life Desert Eagle is pretty rare because it is completely impractical, while S&W M&P is popular with civilians, police, and competition shooters. But in video games the situation is reversed - gamers know Desert Eagle and ask for it when they come to the range.
Besides, there's a third possibility: that the Desert Eagle is simply a "cooler" weapon than the M&P, and hence chosen by gun ranges users and by film and video game producers for the same reason.
TV is 11 DE vs. 23 M&P, and video games 9 DE to 1 M&P.
So if you think that movies and TV shape demand, you would expect to see more demand for M&P at the ranges.
In reality the distribution of guns people ask for at the ranges is a lot closer to what's in video games than in movies/TV.
There are many "cool" guns, but if they're not in video games, nobody cares.
Running a compelling simulation of a shoot out only requires a handful of vectors in memory and a couple of vector operations per frame.
Running a compelling simulation of a social interaction is impossible given our current tech.