" Weren't there massive graves where the Serbs were conducting "ethnic cleansing"?"
In reality, no. We were told there were, but they weren't massive by anyone's standards save those of the limp wrists who run Europe and the States. Nothing to the level of what we have found in the Middle East or what happened to the Serbs in WWII.
"Kosov is at the southern end of Serbia isn't. A Serb once told me that the way to look at this situation is as if Mexico wanted Texas back, that Kosov has long been a part of Serbia. Is this accurate?"
I think that's just silly. Texas was never the Mexican homeland nor the center of its religious faith nor are Americans killing Mexicans and torching Roman Catholic churches from one end of the state to the other.
No, it is wrong analogy, because Kosovo was never part of Albania. Albanians settled in Kosovo for the first time in late 1600s, when Kosovo was under Ottoman occupation.
Better analogy would be if Cubans who reside in Miami, both American citizens and illegals wanted to secede Florida and expell all English speaking Americans out with the help of China and some Chinese-led military alliance.