Not really. It is just reality. The vast majority of people are right-handed. They are not going to magically be able to shoot left-handed in a game when the FPS industry has been built to cater to right-handed people.
As CS was mentioned...it's not so difficult to mirror a model.
It's also a screenshot! Not a commercial fps you have been looking forward to playing for all these years. Screenshot...screenshot..ok, you are coming out of it now.
Here:
Can we move on to real issues?