[gambling8nt]

Community website operators do have a duty to monitor for suicides to some extent, just as they have a duty to monitor for other things. But failure to meet perfection in the pursuit of a virtue is not morally the same as a vice. Online communities have moderators in much the same way as real communities have police--they're society's protection against something going wrong with the social contract. When they individually fail, they may (individually or collectively) bear some level of moral responsibility for the matter, but the buck stops there. The only way moral responsibility can find its way to the top is if it is clear that the community in vastly under-equipped to deal with such problems to begin with, and there is an expectation that such things will be actively prevented within the social contract. When a murder or suicide takes place in a physical town, neither the city (as a political unit) nor the mayor is personally morally responsible; a virtual town is no different.

I understand that you aren't necessarily saying that you entirely believe the views you're espousing; any debate in a public forum should be as much (if not more so) of a benefit for the observers as it is for the participants. Clearly stating both sides of an argument helps everyone involved understand the precise nature of the issue.