Self-interest&#x2F;motivation has its own MO. Also, sometimes motive isn&#x27;t so important - physical behavior is. This is the evidence which can be collected. Otherwise you can&#x27;t really assume much. Your original comment seemed to imply a conspiracy though through &quot;built by&quot;.<p>This is a little detached from the original context though, and there&#x27;s another issue there; People are not random processes, they may choose to pursue selfish strategies <i>conditional on</i> being in a system where it is uncritically &quot;assume[d] people are being reasonable by default&quot;.