Why does el patron choose body guard from other countries

From the text:

“Overcome with shyness, I see,” El Patrón said. “I picked up this lot in Scotland, breaking heads outside a soccer field. Always choose your bodyguards from another country, Matt. They find it harder to make alliances and betray you. Well, Matt, you make the choice. Which of these shrinking violets do you want for a playmate?”