It's a little more than that.
Guys threaten to kill developers all the time over all manner of stupid shit. A game advertised as 1080p that downgrades to 720p at times, a lack of true widescreen, broken promises about control schemes, pushed back release dates, etc.
The thing is, nobody is actually going to kill anyone over these things. When people say the president of Blizzard should be shot for botching the launch of Diablo III, that's just a hormone-soaked mind impotently lashing out in everyday anger in the only way it knows how to handle that situation.
This is different. Why?
Because these guys don't hate men.
These guys LOATHE women.
Some of them do it because of their mothers. Some because of their sisters. Some because they were "nice guys" in high school and didn't drown in pussy as a result.
Wherever it comes from, it's there. These guys buried themselves in video games to escape the world that wasn't being "fair" to them and distract themselves from the crushing loneliness brought on by their refusal/inability to develop a personality women might find compelling and intriguing.
Now... Now these, these women... These bitches... These cunts... Want to step into their world? Like they have the fucking right to make video games? To talk about video games? To criticize video games? To criticize gamers? No, no, no. This isn't their world. How dare they think they can take all these guys have left?
No. Someone is gonna pay for this.
That's what makes this different. The first scenario is anger + testosterone. That's what results in tweeted death threats, screaming fits, holes in walls (if you add alcohol to the mix).
The second one is hatred + rage + testosterone + a feeling of persecution + a feeling of being cornered. That's a bad combo. That's the combo that leads men to do unreasonable things. Things like track down addresses and phone numbers of not just their targets, but also their target's families. Add to that a several-thousand-member "movement" egging them on and being egged on? It's not hard to imagine one of these guys taking the next step and actually hurting someone.