This happens with most subjects to one degree or another. All are given screening. All are put through a variety of procedures to assess their love quotient and their ability to be manipulated to feel and express loving thoughts. This also assists their reproductive experiments to help in bonding individuals to a suitable target when procreation is desired, to study the offspring and prolong a certain lineage. So this is a secondary benefit of manipulating the feelings in addition. They can manipulate humans to tolerate, and in many cases to enjoy, having a sexual encounter with an alien hybrid, and this serves their hybrid genetic program to begin incorporating more and more human characteristics within the alien Grey lineage and begin to re-create human qualities.
These are all overt manipulations going against divine principles and only serving the darkness. There are no benefits to human. All assist the process of learning and growth for the aliens themselves. And when they have learned what they need, humans will no longer have value to them and will only be a liability and will be terminated.
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