I never said it's acceptable, but when twitter has close to 200 million daily users, you're going to get some death threats when you do something that makes people upset. And it's blatant PR when the company is forcing the devs to do even more crunch time, then tweet about "death threats" and you see the conversation immediately switch from critical to supportive. It's also not like tweeting "Death threats are NOT OKAY" is going to change the mind of the kind of people who send death threats.