As we develop "affective" computers, remembering that simulated thinking may be thinking, but simulated feeling is not feeling, simulated love is never love.
I'm not sure I buy this particular quote. It makes me think of the short story by LEM about the scientist who creates a simulated civilization to appease a despot. However, he realizes that he did to good of a job and needs to go back and liberate it. Now I don't think characters in the Sims need to have their feelings especially cared for, but I don't see why an entity that could think and has simulated feelings wouldn't quite possibly become morally problematic.