My response is the friendly version, and I think that it is actually relatively mild considering where I am coming from. I deleted one sentence, but pretty much the worst I said is to call Acty's position "repugnant" and engage in some sarcasm. I took some pains to depersonalize my comment and address Acty's position as much as possible. Most of the harshness in my comment stems from my vehement disagreement with her position, which I did back up with arguments. I invited Acty to correct my understanding of her position.
I think Acty is a fundamentally good person who is misled by poor moral frameworks. I do not know any way to communicate the depth of my moral disagreement without showing some level of my authentic emotional reaction (though very restrained). Being super-nice about it would fail to represent my degree of moral disagreement, and essentially slash her tires and everyone else's. I realize that it might be tough for her to face so much criticism in a welcome thread, especially considering that some of the critics are harsher than me. But there is also potential upside: on LW, she might find higher quality debate over her ideas than she has before.
Your hypothetical response is a good start, but it fails to supply moral criticism of her stance that I consider necessary. Maybe something in between yours and mine would have been ideal. Being welcoming is a good thing, but if "welcoming" results in a pass on really perverse moral philosophy, then perhaps it's going too far... I guess it depends on your goals.
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A few notes about the site mechanics
A few notes about the community
If English is not your first language, don't let that make you afraid to post or comment. You can get English help on Discussion- or Main-level posts by sending a PM to one of the following users (use the "send message" link on the upper right of their user page). Either put the text of the post in the PM, or just say that you'd like English help and you'll get a response with an email address.
* Normal_Anomaly
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* Barry Cotter
A note for theists: you will find the Less Wrong community to be predominantly atheist, though not completely so, and most of us are genuinely respectful of religious people who keep the usual community norms. It's worth saying that we might think religion is off-topic in some places where you think it's on-topic, so be thoughtful about where and how you start explicitly talking about it; some of us are happy to talk about religion, some of us aren't interested. Bear in mind that many of us really, truly have given full consideration to theistic claims and found them to be false, so starting with the most common arguments is pretty likely just to annoy people. Anyhow, it's absolutely OK to mention that you're religious in your welcome post and to invite a discussion there.
A list of some posts that are pretty awesome
I recommend the major sequences to everybody, but I realize how daunting they look at first. So for purposes of immediate gratification, the following posts are particularly interesting/illuminating/provocative and don't require any previous reading:
More suggestions are welcome! Or just check out the top-rated posts from the history of Less Wrong. Most posts at +50 or more are well worth your time.
Welcome to Less Wrong, and we look forward to hearing from you throughout the site!
Once a post gets over 500 comments, the site stops showing them all by default. If this post has 500 comments and you have 20 karma, please do start the next welcome post; a new post is a good perennial way to encourage newcomers and lurkers to introduce themselves. (Step-by-step, foolproof instructions here; takes <180seconds.)
If there's anything I should add or update on this post (especially broken links), please send me a private message—I may not notice a comment on the post.
Finally, a big thank you to everyone that helped write this post via its predecessors!