I have not read this whole thread nor seen the videos, so please excuse me if I repeat what may already be here. There was something infantile about him. He never developed into adulthood like his brothers. I suspect his father had him castrated to preserve his voice. So sad if true.
I would say it is rather unlikely that Jackson was the biological father of his children given that he was black and his children are white/caucasian. So that he was castrated is a possibility IMO especially with such a cruel father. In terms of his voice having been very high, even in old age: I have heard interviews of people who knew him and they said that his normal voice that he used outside the public sphere was pretty normally deep for a male. So that voice argument doesn’t have to mean that he was castrated.
MJ's father wasn't maliciously cruel so he wouldn't have had MJ castrated. Even if we couldn't be sure of this, which we can, there's evidence of his voice being much deeper and masculine than people think, evidence of MJ staring at women appreciatively and lustfully, evidence of facial hair growth and normal hair thinning, and evidence of acne and voice cracking during his puberty years. The man had his bits intact.
In Europe, starting from the mid-16th century, there was a
trend of castrating male singers before they hit puberty so that their singing voice would remain boy-like and wouldn't deepen. (Thankfully the trend eventually lost steam and was outlawed in 1903.)
Back in 1994, they made a movie about
Farinelli, a celebrated 18th-century castrated Italian opera singer. A magazine was being published in our country back then, and it used to have a small segment where a well known public figure was taken to the movies, and later on gave their opinion about the particular flick to the accompanying journalist.
A respected older physician watched Farinelli, and I remember him mentioning how the main actor was "wrongly" cast. The doc critiqued how his facial features were too masculine, when considering that he supposedly had never had a normal puberty with sufficient amount of testosterone. (Naturally there aren't any castrated actors available, but I reckon he thought that some make-up/prosthetics could have been applied, etc.)
Recalling this, out of curiosity, I searched for pictures of MJ from a period prior to his cosmetic surgeries, and 1978 seemed to be a "turning point" (he was 20 years old at the time). Here's
an example, where he seems to be a pretty normal looking young guy, with well defined facial structure. (Acne and signs of five-o'clock shadow seem to be present also.)
The video clip posted by grini nicely illustrates the voice issue:
Theodore Riley (music producer, etc.) explains how MJ intentionally exercised his voice daily (as instructed by
Seth Riggs, a voice coach), to be able to reach those high notes consistently. At the end of the clip, there's a video taken at a concert where MJ talks in a deeper voice, and then immediately switches to his higher singing voice.
As A Jay wrote, there is much evidence that MJ's manhood was well preserved.