Because the language barrier is annoying. The fact they cause a lot of problems as well is also an issue when it comes to getting things done like when they steal your eggs, Halloween candy. Ect... The part that confused me the most is why do they stay on graal? Mostly everything is in English or everything is in english. I don't think anything is translated to them. Which even if it was it would make no sense why you wouldn't create a server just for them so it fixes language barrier and whatnot.