"Stop accusing me for something I knew well ahead of time qas bad ;-;"
No, you're literally blaming the victims here for something they're in no way at fault for. It's the hacker's fault for hacking into the service. Having faith in the keydat format is a more than reasonable thing. So if you really,
really wanted to get into pointing fingers uselessly here, you could blame badspot for having an insecure key.dat format.
The users were assured that the service was safe as well, so why not blame cowboy for all this? Or how about the programmers that made whatever software caused the vulnerability? Your whole theory of the users themselves being at fault is bullhit.