guys do Olympic lifts because Nebraska was huge on those in the 90s and that's when a lot of these guys were getting started. Not a lot of thought goes into it.
And the "strong man" nonsense comes about because some guy thinks "hey, squats are boring. I want the same thing for my guys that squats would get without them getting bored." And then they all don their cut off jean shorts, sandals, and tank top (a "World Gym" one is preferred) and go flip tires in the parking lot for a few house like a bunch of idiots.