When you consider exactly how much information we have to go on, I think people are overreacting by immense proportions.
Do we even know why Victoria was fired yet? Maybe she was about to blow the lid off a vast internet conspiracy. Or maybe she's actually the bad guy, and she went crazy and tried to destroy the office. We just don't know, and we might never know.
Besides, what is reddit corporate supposed to do when they want to fire an employee? Message the mods and say, "Oh, btw, we're going to fire Victoria in a couple days and Xyz will take over her duties, just thought you'd like to know."? That's simply out of the question, and not enough people even thought about this scenario.
The responses to this event are entirely unjustified, because there is no information at all to base a reaction on.