I don't know how they manage it, but they seem to seek out posts where someone is clearly needing support and a handhold, and these posters go 'Yasss!! I can put the boot in right here!!!' and they swiftly do.
I imagine them as sad lonely gits with no pals or anyone who likes them and they take out their frustrations on mn by making someone who feels bad already, feel a whole lot worse. Then they're all chuffed with themselves for doing so.
I wonder if it's cos this site is so big now, they can hide and pop up when it suits them? There was always arsehole posters here, but lately I've noticed a lot more. It's like when I read a thread title asking for help I know the first few posts will be snippy put downs straight away.