Livestock can be generally turned into pets if you wish them to and that's usually easy on one side because they are basically herbivores. Just stock up on grass and you'll be good. The other problem is that they sometimes come with crazy shenanigans that can drive you mad. Most of the time because there aren't that many companies who sell products that help you handle them. Unlike dogs and cats who have a large market willing to spend more for their pets, goats aren't that popular.
And because of that, these owners improvised to make sure that their goats don't hurt anyone when they feel like headbutting anyone. Unfortunately, goats don't actually headbutt with the end of their horns (which these people put pool noodles on) and the only function it has is to leverage things and regulate temperature. They headbutt with literally their head (strong thick skull and the base of their horns), so you should be covering their head, not the end of the horns.
But that aside, these goats have been looking hilarious with the new pool noodles that make them seem safer (they are not!).
While training while your goat is young, to avoid any aggressive behavior when they grow up, is the most desirable course of action, this pool noodle solution is a cute and funny temporary solution. How long they actually stay on the horns before they are ripped off and chewed is questionable, but if it protects someone from injury then why not?
Aggressive behavior can be anything from simply stubbornly disobeying and showing no respect to owners, to biting, kicking, and pushing things around with their sharp little horns. They don’t always do it on purpose though, these pool noodles can protect children playing with goats from getting hurt, or perhaps during milking.
And it’s not just pool noodles! People have improvised in all kind of ways to protect them from headbutts. From buckets and duct tape to tennis balls stuck on the sharpie bits.