When a keyboard-commenter initiates an online engagement, it resembles setting out to cross Niagara Falls on a tightrope.
He can suddenly wake up to the reality that this is getting very unnerving, out there in the middle, with nowhere to go that can be easily reached.
No. Now it is going to take a great deal of arduous and dangerous maneuvering to survive.
But that's the nature of engagement.
If one doesn't have the conviction that he is really up to sudden wind gusts, and a loss of nerve, he might do better staying at home and safely watching the spectacle on the ten o' clock news.
Meanwhile, those less impulsive, safe people are watching, secretly hoping for a spectacular fall into the icy waters. Like the crowd at an airshow, or a motorcycle race.