Why does Korea always thrash every body else?

Because they're Koreans.

Koreans as a culture just go 110% on everything they do. Like it's insane the amount of effort they put into everything.

They take esports for more seriously then any where else in the world. There was a starcraft 2 pro competing in his first global tournament and he commented on how he was absolutely floored by how much fun western players were having while competing.

The west took the idea of coaches, analysts and having a support staff from Korea. The biggest difference is just in the attitude of individual players. They push themselves to succeed to almost an insane degree. Piglet and other Korean players have talking about how they've gotten physically sick when under performing due to the stress.

they don't thrash everyone anymore regions are catching up, slowly. winning and trashing are different things.