Yeah, I'm inclined to think people can grow. There's a reason juveniles convicted of crimes, even serious crimes, should be given a second chance and are given a second chance in most civilized places.
College is where things start to firm up for most people, though. I don't think I've ever known anyone who was a terrible person in college who turned out good.
I just grow tired of hearing people trot out a thing Zuck said in college, when there are so many far worse things he's said and done since then, and with the weight of tremendous wealth and influence backing them.
The thing he said in college was shitty, and indicative of a spoiled, entitled, child of wealth and privilege, but saying it was basically harmless. Worse things might be said at the corner sports bar on any given night in any city in the country.
But there are things you say as a young person that are revealing of core personality traits.
Most people would just not say that.