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I guess this is right, but it's also in his/her interest to neg-rep as many accounts as possible, in order to increase demand for farmed accounts. In my opinion, account-farming and default trust are in a clear conflict of interest.
That is a point. I dont think that the amount of time QS invests in haunting (not a typo) scammers is worth the coins earned through sales to said scammers. I would like to think that the majority of their customers are looking for a spot in a signature campaign. Arguably this would make their actions against spammers a conflict of interest as well. Every spammer banned is a possible future customer. The new account will probably get banned as well, because the do not learn the lesson or dont care because they still ROI.
I'm not sure this is correct. Every neg-repped account just makes future customers for farmed accounts with the same rank. Since buying-selling accounts is not considered against the rules, presumably everyone QS gets kicked out of a signature-ad campaign just comes back to him trying to buy in again.
I personally think its part of beeing human to contradict itself.
Okay, your last point is philosophical but there's a real difference between contradictions inherent in human nature (whatever those are) and clear conflicts of interest in which, say, a government regulator has clear ties to the industry he/she regulates, etc. These clear conflicts of interest are system problems that can be identified and avoided, the philosophical stuff you refer to seems much less actionable.