Well, I suppose because the reasons they stated are not the real reasons. They hacked Ana's and Jelena's sites because they did't have better things to do, and fighting for "their rights" was just an excuse for their urge to do stupid things.

Haha, and what are they trying to say with this:

"And about Ana yes she is so beautiful dont know how a serbian can be so beautiful or maybe she is not" – Make up your minds kids! Hahaha.

KosovaHackersGroup wrote:

Hello PPLs here i removed the hacked message,and i see that serbian people never change that's why your sites are being hacked,Kosovo its Kosovo its a Republic so you have to acept it ,thats the reality
And yes we thought that sport has nothing to do with politic but FIFA decision for not letting Kosovo to play friendly matches proves that even that they say sport has nothing to do with politic they are laying so we diceded to hack sport sites,we always atacked the government sites but now this changed cause of some crazy people like novak jokovic,Milorad Cavic saying politic messages against our country so sport palyers they have to do their work,playing sport and not speak against other country
And about Ana yes she is so beautiful dont know how a serbian can be so beautiful or maybe she is not ,but what to do she is from Serbia and that is the reason why here site its hacked,so from now the site its free from our team but if she is going to say something against our country you have to be sure that we will be here again and not like this without damage just changing a forum name,but we will do big damage

i can see her site is written in poor php and probably uses some easy-to-hack open source CMS