DefaultTrust is default. No one bothers to customize their trust settings.
So when you see "Warning: Trade with extreme caution!" on their profiles, you automatically think this is a scammer. But when you look at the reasons, you see words like: shitposter, spammer, etc which I don't think means the person is dangerous to trade with!
How would you like if I label you a murderer but all you did was a traffic altercation? Totally unjust and broken is the trust system.
Because I know the politics behind the scene here. Those trust feedbacks against Quickseller is basically biased and subjective. But to a newbie, it's totally misleading. If you hate him so much, ban him.