Would your trust in human mankind be broken if you found that a long term Fluther member turned out to be not at all the person he or she had always pretended to be?

I have no knowledge or suspicion about any Jelly.
This a purely hypothetical question.
A long serving member could be any Jelly that sticks around for, let us say, two, three years and is often contributing to the site.
Now, from out of the blue that member starts to behave in a way that is totally contrary to her/his behavior in the two, three years prior.
Think: trolling, looking for ‘fights’ for the sake of ‘fighting’, etc. I guess you get what I mean.
Besides probable shock, would you feel disappointed in humans?
Extra or less disappointed because, after all, it was not a ‘real-life’ acquaintance/friend to you?