I think you're missing the point of the protests. Yes, the general reddit population is upset because they liked Victoria, and that's not a valid cause for protest because we don't know what she did to warrant a firing. The protest, on the other hand, is being done by mods, because the mods were not given any notice, or any assistance in dealing with her absence.

Generally when you fire somebody for fucking up, you find somebody from among your remaining employees to fill their shoes until a new employee can be hired. You also let your clients know about the situation and assure them about how you will be meeting their needs going forward. In this case, the mods are reddit's clients. They bring in the revenue. They were not shown this standard level of consideration, and they find it to be in keeping with the general lack of support and respect they receive from admins over the long term.

In short, it's nothing at all like the harassment subs protest.