The unfortunate fact for Ellen Pao and the shareholders is that the value of Reddit - its intellectual property - is entirely supplied and moderated, for free, by volunteers.
That is the struggle here: between the people who want to corporatise and monetise Reddit and the people who actually supply the content. Unless lead by someone who is visionary, charismatic and genuinely interested in advancing the notions of community and free for all that attract the moderators in the first place (which Ellen Pao is demonstrably not), the moderators will rightly ask why they are doing all this work to greatly enrich other people.
There are some shit managers, but usually managers attempt to communicate when there's issues and give good warning before terminating except in cases where the company is downsizing or you pissed off the CEO since that happens from higher up. But even then, you'll hear it from fellow employees that the company is removing the dept. or the CEO hates you. I am hard pressed to believe that she was abruptly fired, no matter how well she treated the Reddit community.
To be fair the reasons you stated have been discussed endlessly on reddit.
I agree that petition could have been written better though. I didn't even think to read the description until you mentioned it. I doubt many others have either, they just read the headline (as usual...)
Like, I understand that these people are upset, and I've said stupid shit when I've been angry, but really, this is a petition to try to change something. Use a little bit more eloquence, and back up your arguments with data. Like, if they're talking about voat.co, are they really trying to insinuate that Voat gets nearly as many views as Reddit? And, wasn't Ellen Pao already interim CEO before the trial concluded?
100,000 + signatures should still count for something, and I imagine anyone with a vested interest could do a little investigative work to understand what's really going on.
The sheer amount of natural language written about the topic on reddit and elsewhere should tell you how many people are interested in the subject of reddit's management.
The petition was started some three weeks ago, but the number of signees hovered around 10,000 until the last few days. Also, over the last few days the number has risen at a consistent pace.
I assume change.org has some filter in place to attempt to achieve uniqueness. Regardless, the problem you're describing is a function of voting on the internet, not any particular community. Given interest and opportunity, there are individuals in any community that would try to rig the system. For example, competitions shared on Facebook, or even whole countries.
Remember when the genius sleuths of reddit wrongly accused an innocent man of the Boston Marathon bombing? Or all the ridiculously borderline illegal subreddits (jailbait, creepshots) Hell, there's an entire wikipedia article devoted to redditor drama: https://en.wikipedia.org/wiki/Controversial_Reddit_communiti...
I get the feeling that a lot of these people don't like is that Reddit is not what it used to be in that it's a "free for all" because it's now more business oriented, meaning that Reddit has to cater to its shareholders just as much as its community. They don't see past the fact that someone that supported them was fired and see the reality that these things happen, and it sucks, but it's a reality of a business. As an aside, if the moderators had such a problem with what was going on, they should have been much more vocal about it and raised flags before instead of acting like children and throwing tantrums by making subreddits private (I call it a tantrum because they made it private for like 12-24 hours, most of that time during the US night where there's not as much traffic).
I'm not saying Ellen Pao is the best person for this job, and while I don't have super high opinions of her, I don't believe all the stuff Reddit says about her either, and she's being vilified for something that could have been completely out of her control. If you want to give a justification for "firing her", at least use the one that she's not very connected with day-to-day of the non-business side of the site, the community and the volunteer moderators, and that she doesn't use the product she's the CEO of. But given they've raised a lot of money recently I'd guess she doesn't seem to be doing poorly to the shareholders/investors, or at least isn't doing a piss poor job.