Unlinking nicks from your real identity is fine, but for example the user I'm using is fairly verifiable not to be a government account. There's way too much effort and original content in my account. Or if I'm a government bot (it's still possible), I'm a very expensive one that wouldn't scale because of all the on-topic original content that's required.
As for harassment: no, that was never my intention.
This is why I'm considering closing all of my social media accounts even remotely linked to my real identity -- reprisal is a very real threat.