How to explain to you, man. Is it even possible for you to understand with all indoctrination you have in yourself.
Let me try.
Did you ever experienced communism or herd about it? Or, did you ever experienced propaganda about the USA as the cradle of democracy?
See, similar way works Christian Churches. Actually, any global religions. Its brainwashing. Vatican, in this particular case did great work here in the region. For its own sake and for the sake of German expansionism to which serve Croatia.
Now, imagine Catholic Serbs that are turned into Croats and knows they are Serbs but can`t resist to brainwashing of Vatican that insist they are not Serbs but Croats and they passionately hate themselves and hate Serbs. Then, those Catholic Serbs, some of them, start killing Orthodox Serbs and remaining Catholic Serbs who refusing to be Croats. That happened in WWI, WWII in this last Civil War.
And you ask me how I feel about Croat suffering, let`s say of suffering of those who are very convinced to be Croats. I have mixed feelings. They are MY people no matter they are brainwashed, globalized and mentally destroyed. Like wild animals they should be contained, not destroyed. That is how I feel.