This is laughably, shockingly, categorically wrong. People can and do change, all the time. Your opinions, values, etc didn't change from when you were in college?
Sure, my opinions, values, etc have evolved along a continuum since my college days, yes. I've learned a ton, and make fewer unforced, stupid errors. I've had some damaging tragedies since that time that made me more wary and empathetic to others facing similar difficulties. I am more complex and nuanced.
But, my character, my moods, my tells, and the fundamental flow of my thought processes have never changed. I'm the same lumpish animal I was when I was a tot. When someone says "People don't change", I think the core of that sentiment is that the brain wiring that makes random person X who they are never changes (save the brain becoming damaged or fading, of course.) I'm talking about the essence of a mind.
So I contend that a creep like Zuck doesn't uncreep himself. A sociopath is wired that way, even if they're proficient at hiding that fact. You might say, "Zuck's been exposed to and riding atop a business operating at a mind-blowing scale and pace - that HAS to change a person!" I think that's just projecting what one thinks would happen to themselves in such a situation. What change can you actually point to in Zuck?
This is laughably, shockingly, categorically wrong. People can and do change, all the time. Your opinions, values, etc didn't change from when you were in college?