If it drives someone away for there to be one or two harsh replies in a thread FULL of helpful information, then maybe they weren't so serious in the first place. It would be nice for the internet to be populated by only the most kind wonderful folks around, but it's real life.
The thread you mention is not full of people jumping on anyone. The couple harsh replies could have been much nicer, but people also said "Hey tone it down, he came to ask".
If this site is too harsh for you, I don't suggest you visit many other ones out there, because this is a really nice forum, with good moderators.