Because Kim is super rich, they wouldn't have raid him in the US. It would have been like the Madoff arrest, knock on his door an arrest him. Hell they may have even contacted his lawyers and asked him to surrender.
Schmitz had fled several countries previously to avoid being jailed, why should this time be different? Because of his vast amount of funds and his loyalty to no one, he was a flight risk, so they decided to pick him up. However, they knew that was going to be tricky. Schmitz has an enormous mansion in a rural area. He has a large security staff and a private helicopter. In the end, police “neutralized locks and cut their way into a safe room, where Dotcom was found with what looked like a sawed-off shotgun”.
