I think it's also a cultural problem.
Members of some cultures feel more offended by some things than members of other cultures. Like Germans & Shooters, or U.S. citizens & sex.
In the end, what we will see is the product of the mind set of the people working for Steam. If they are of an U.S. based mind set, then we'll see that - more shooters, even of the grossest violence, meanwhile very little or no sex in games at all.
The opposite would probable be seen if Steam was run by games of a … let's say German mind set. It would even be different if Steam was run by people of an Mexican mind set (death is an not unimportant part of their culture). Or if Steam was run by people of an Morocco mind set (which also shows how little we still know about other countries).
However, even if Steam was run by people of a German mind set, the U.S. cultural imperialism has trained gamers all around the world even so far that they nowadays see shooters with even a very high degree of violence as something so much natural. So natural, in fact, that masses of gamers would very violently protest against shooters being withdrawn from Steam.
Face it : The international community of gamers has been very effectively trained by U.S. based - and by u.s. domination - of game development studios,
that problem solving through nonviolent diplomacy is considered as something weak and unmanly,
meanwhile problem solving through violence is all around the world an totally NORMAL and accepted way of solving problems. Even if a person is having a problem with a whole school.
U.S. based cultural imperialism in gaming was frighteningly effective.