If you're working retail and your job is to deal with customers I highly doubt your boss will let you withdraw communication with your customers because some of them were verbally mean.
Retail usually calls the cops and bans customers who threaten or scream at employees, which is the real world version of withdrawing communication.
I get your fee fees are hurt because a video game was not perfect, but people flinging shit like caged monkeys get shut down in most jobs. Its not excusable just because muh vidya gaem
You can block emails as well. You can moderate your steam forums and youtube comment section and Twitter replies. I can't think of a single place where CO is interacting with the community that they can't block/ban users who are mean.
What's your point then? Of course they have forums Steam and paradox forums and reddit are the main places to interact with Colossal order. CO has never said they are getting death threats so I don't know where you get that from.
It seems that you're getting misinformed by game journalist blogspam. CO is mad that the mood on their forums is sour and they are getting called out for releasing an undercooked buggy game for full price after months of misleading marketing. Everytime they post an update the comments are filled with sour posts complaining about real issues that have still not been fixed 3 months later.
If you get 10,000 death threats from 10,000 individual accounts, blocking or banning them does fuckall. You still recieved 10,000 death threats. And..... Ive fuckin seen the twitter posts dude, I dont need CO to tell me about them. They likely arent mentioning them to prevent the risk of increasing their volume.
But, again, you are talking like a kiwifarm reject, so Im sure youre one of the people sending this "fanmail"
I mean, you're right, that's just life™, but that's still fundementally fucked up. For profit companies have to do that because they want everyone's dollar, and if that means you're a better fit for a job because you can deal with people being awful, then... It's a shame we've ended up in that position, societally.