Your suggestion implies that Google manually modifies the results it gives to some search queries.
2. Manual modification isn't necessary in this scenario. Confused and frustrated people like those I describe above are likely to hit the back button, and that's a strong signal that this result wasn't what they wanted.
They clearly are able to create result sets crafted by their employees for specific search terms.
They are clearly able to modify search results based on a rule system.
These have to be manual. This does suggest that effects and probably the search results for specific terms can be manually modified