I also grew up around large flocks of sheep and found that when you isolate a young lamb and socialize it: lots of fun. Socialized lambs will recognize human friends and will respond to a given name and hang around and play. But after a year or two, after any time spent back with the flock, they forget humans and revert to being one with the herd. Older isolated sheep just get mean and end up being lawnmowers if not mutton. I figured we'd just bred the fun out of them, with a small remaining playfulness coming out while a lamb. I'd be curious to know more about wild sheep.
Growing up an a hobby farm with 20-40 (depending on the time of year), this is my experience too. Lambs are playful and full of spunk, but as they grow older they quickly become full-time grazing machines. Rams are just vicious.
My favorite was the person who happened to be burning a boat for fuel when it was being debated whether a crew could survive a shipwreck for years by using the ship as a fuel source. https://news.ycombinator.com/item?id=10803552
Aggressive rams are partially a byproduct of testosterone and selective breeding, some small scale farmers will leave rams in with ewes and their newborns to protect them from predators.
