The main reason social psychologists want their experiments to have impact on subjects is that, without impact:

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Social psychologists want their experiments to have an impact on subjects so that their reactions will be spontaneous and thus the results of the experiment will have relevant meaning. If subjects are not impacted, their behavior may not reflect their true responses, leading to inaccurate or meaningless results. Choices A and D are not valid, as an exact duplicate of a real-world situation can be achieved without impact, and subjects guessing the hypothesis of the experiment is not necessary for the experiment to have an impact on them. Choice B may be a valid concern, but the primary reason for wanting impact is to ensure the validity of the results.

The Main Reason Social Psychologists Want Their Experiments to Have