These are all really interesting questions that you pose. I know for myself when I get done with a day of studying, I'm in medical school training to become a Physician as well, there are very few things quite as relaxing is opening a beer and loading up a video game. Sure, exercise or spending time with my significant other can also provide that outlet, but that's not what this forum is about.
However, as I was reading these questions, I couldn't help but ask myself, "are these not emotions and feelings others experience for their preferred hobby?" To me it would seem to be the point of having a hobby, a guilty pleasure, a release whether it be woodworking, knitting, reading, bird watching, etc...
There are two reasons, in my mind, for our preferred hobby to be so criticized. One, we isolate ourselves from mainstream culture. Yes, videogames are becoming much more mainstream, but look at the titles that sit on top: CoD, Gears of War, Halo, etc.. Games that are so easily misinterpreted, maybe, as violence-simulators by those who doesn't participate in this medium. This niche, clicky, pigeon-hole we put ourselves in, as "gamers," does such a disservice to ourselves. It cheapens the medium, and it marginalizes us. The second reason is the 1st-person aspect. Yes, books and movies have been depicting much more violent and more difficult material (rape, incest, etc.) for a much longer time, but they do so in a more passive manner. I believe this is what can make videogames a much more powerful storytelling-medium: Who doesn't remember the Airport-Level? But, as part of being a 'marginalized' group of people participating in a 'cheapened' medium how is it hard to see how this can be misconstrued as nothing more than mind-numbing violence-training?
So, what do I think we should do? For one, I don't thing stereotyping yourself as a gamer does any good. Yes, I understand that it's a sub-culture and there are others one can point to such as knitting circles, book-clubs, marathoners, but when was the last time you had someone self-identify as a Knitting circler? Sure it's part of their life, but it's exactly that part. I never understood why we had to wear it as a badge of honor. The more normal we make it to come home and relax playing a videogame, not as a 5-16 year-old boy, but as an successful adult/young adult/parent/grandparent the more we'll expand our medium and move away from this marginalized-group of people we find ourselves as now. Of course there will still be controversy, but I'd venture to say we'd see our medium start tackling even more interesting, difficult, fun, material in the way that books, movies, & TV do at the moment (I realize there is a cost difference, but let a man be optimistic).