I don't know if I'm the only one here but sometimes I want to say something but I don't want it tied to my account, my reasoning being the more details I let slip eg:
I've worked in IT
I've lived in that town
I own a labradoodle
..these things all piece together till you can profile it down to one person, you essentially de-anonymize yourself the more comments you make. Being that this is a public forum anyone can scan this information now or in the future building a profile on users possibly identifying them as a person, this is an unintended side effect as we don't post online comments expecting them to be traceable to our person. Consider the fact that advancing computing power and AI may eventually make it trivial to do such a thing.
Sure you can regularly create new accounts but then you reset the trust system.
My suggestion is having the ability to post a comment but not display your username, you would still be accountable to the trust system it's just that outside Tildes's server you wouldn't be identified. This would still discourage people from being a jerk because they're still affected by the trust system.