Reasonable argument and logic.
However, just does not fit the facts that have been evident for more than 55 years.
Well let’s explore possible motives for their actions. (Using the evidence as published in the popular literature)
Why do they abduct (re-abduct) humans?
The aliens seem to be gathering biological samples. They may seeking cures for diseases as we do in the jungles of Amazonian rainforest or they may be seeking an efficient way to exterminate us.
They implant devices in human bodies.
These devices may be tracking devices to monitor our movements much as we monitor the movements of whales with radio trackers. The device may be similar the implantable chips that have been proposed for carry your medical history. These implants could help the aliens track their research.
The artificial insemination of women.
May be controlled genetic research designed to find common genetic mutations, the best places to implant artificial genes that will be passed on from generation to generation with out modification.
It is possible that the aliens are trying to design a specific human that can carry and spread their genetically engineered virus with out succumbing to the disease, a typhoid Marry. They may be creating and marking (with the implants) their genetically modified weapon carriers so that when they are ready they can infect the carriers with the virus and send them out in to the general population to infect the human race to wipe it out.