@tiredoftattler well, being completely honest, i don't believe that. I have been on some of the same threads as you and there has definitely been abusive comments.
Just because you don't know someone doesn't mean it's not an attack. I don't know you, but if i called you names, it would still be an attack. If i said i felt sorry for your children having you as a mother or step mother - it would be an attack. It doesn't matter that we don't know each other. Its still nasty, it's still hurtful and it's still what makes this board an unpleasant place.
I don't think we can learn much from comments like these - other than "this is how not to behave".
It isn't that people are "so unhappy and fragile" that the perspective of strangers upsets them - the comments are upsetting. You don't need to be unhappy or fragile to not particularly like being called a horrible person, told that you obviously hate your step children, called selfish, stupid etc. All these things have been said on this board, and are said, frequently.
People can still have thoughts, they can still have an opinion, but why do people feel entitled to be so vile with it?
I might think a poster is in the wrong, and if they're asking for advice i will give it. I am not scared to disagree with a step parent, and because i've been through a lot i feel i can comment, and be helpful with it. However, a lot of people comment because they simply just want to have a go.
If anyone is unhappy and fragile it is these posters who are nasty to others just to make themselves feel better for a fleeting moment. It's basically trolling.