出る杭を打つ is drawn from a Japanese saying that is basically the opposite of the American saying 'the squeaky wheel gets the grease'. He is taking an even larger risk than Sanahtlig is hinting at by saying this. Japanese companies in general do not take kindly to their employees putting the company out there on a limb, and the industry already suffered badly as a whole from the infamous Rapelay incident and a number of follow-up incidents.
I don't think those of us over here can really comprehend the pressures the average Japanese companies are under. For one thing, social pressure can turn into economic pressure with alarming swiftness over there. For another, Japan is reliant enough on other countries' trade for its survival that these kind of scandals overseas can cause hysterical reactions from their lawmakers. The eroge industry, being a niche industry by nature, is vulnerable to crackdowns in a way that the car and food production industries aren't. Since eroge are basically a guilty pleasure and a luxury, there are plenty of lawmakers that wouldn't see a problem with doing away with them if it meant they could improve their own chances of remaining in office. It isn't like they are universally accepted, even by otakus... so before you criticize eroge-makers for being 'xenophobic', you should at least try to see the bind they are in.
Because it only takes one "scandal" for everything to be destroyed. And trust me the West is the best at coming up with scandals.
There's demands by fans, but over here you also have all the people who turn games into a political thing and would likely attack many of Japan's games to fill their political agenda.
The west is plagued by people that work for the sole sake of running their mouths over every little thing and turn it into a national issue. Because they have nothing else to do with their lives but to complain, otherwise they have no jobs. Eroge becoming popular here would be like building a huge bait for them.
I'll say it again, all it takes is one game to get enough attention to make the whole company come crumbling down.