The issue with the Arq 6 release was not that it was bad per se, but that there was no clear _public_ communication from you. This was twice as jarring because in recent years you've been making comments to the effect that it was no longer just you, but a team. So not hearing anything official for days, if not weeks following such a disastrous release cost you a great deal of goodwill. For every email you got, there were 10 people who didn't bother to send one.
The hate and personal attacks you were seeing were a side-effect of that. The rule of thumb for when you screw up is that you _must_ talk to people. Tell them, verbosely, what's happening on your end, what caused this, what you do to prevent the same from happening again. Talk like a chatter box. As shallow as it may sound, this shows people that you are on top of the things and it builds sympathy. All you have to do is to demonstrate that you are feeling the pain and working to resolve it. Once there's a critical mass of users that are supportive of your recovery efforts, it will prevent others from turning into trolls and haters.
Talk to your users.
You weren't doing this, not in public. That was the main issue with Arq 6 release. Not that you screwed up.