I delete after posting or give up half way through typing half the stuff that would be my input as there's nothing you can say, no matter how casual or trivial a point, that won't attract the wrath of some self righteous keyboard warrior.
The deciding thing for me came a while ago when some cycle commuting chap was flamed for daring to complain that a car had rolled into him at a stop sign. The guy was hit by a car, and even that wasn't good enough to avoid him being treat like an idiot.
It made me realise that when you post something on STW you're wrong, whatever side of an argument you decide to fall on, even if it's both. And everyone will just automatically assume you're an idiot, whatever you say.
Keyboard warrior hindsight jockeying. And it's a real shame, as the people I've met in real life have all been sound. Mountain bikers in general are a lovely bunch, and I want these forums to be ace, and they can and have been at points in the previous 5 or so years I've been on, but at the moment it's just ridiculous.
I wonder who's going to be the one to hit me with the old faithful 'don't let the door hit you on the ass on the way out' line.