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And ((the city elf origin's rape themes)) added what to the game? Conversely, if it was omitted, would you feel the game lacked "something"?
It added drama, a great demonstration of cruel but historically realistic power dynamics and a tragic, touching, original and badass beginning to the main adventure. If it had been omitted we wouldn't have known to miss it, but you can say that about everything. If Joker had never existed in the Mass Effect series, would you have felt that it had a wisecracking-pilot-with-glass-bones-who-falls-in-love-with-a-robot-shaped hole in it? Probably not. Does that mean that Joker added nothing to the series? Hell no.
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I was under the impression that this game is about exploration, driving the Mako, finding a new home world, finding resources, fighting off enemies, potential battles in a sp-to-mp-to back to-sp play and generally attempt to survive in a hostile cluster.
Why would the writers and Art Director even come up with the idea of integrating "sensitive topics" into the game? Yes, it's a story but it is the story of the Pathfinder's journey into becoming the new hero.
In any case, you'd think the new colonists would be vetted for "fitness" for this very crucial mission. I doubt a rape scene or a racist protagonist adds anything of value to the game's primary mission.
Well, as it is an RPG you'll most likely have to talk to someone at some point too. Hopefully someone with a personality and circumstances you can relate to. Which means drama and characters and dynamics that draw on the human experience to tell awesome stories in the game. The human experience tends to include at lest some "sensitive" things, and implementing those in games make them strike closer to the heart.
Lies, cold pragmatism, betrayal, war, death and heartbreak are all things a lot of people find offensive and/or too close on some level, but would Mass Effect 3 not have been a little less awesome without the opportunity of having to tragically gun your friend and longstanding comrade Wrex down because he couldn't live with you lying and sabotaging his violent and unstable species to save the rest of the galaxy? Issues like rape can work the same way. They obviously don't HAVE to feature in a game, but if they're handled well and add to the story and the atmosphere the developers want to create then including them makes the game all the more authentic.
On an unrelated note, I'm pretty sure more soldiers and ex-soldiers than rape victims play Mass Effect, and I don't hear anyone suggesting that all violence be cut out for fear of offending anyone with PTSD.