As for your comment about Mexico, it smacks of 'it could never happen to us'. Of course, it couldn't happen in the US because it's far too powerful for outside influences to play puppet master as they did in the Balkans. But the point is absolutely valid.
If there was a separatist movement in the States where its members started killing policemen and carving the insignia of their group on their bodies before dumping them to be found, I'm sure that there would be a VERY violent reaction. This is exactly what was happening in Kosovo (as was confirmed by Robin Cook in the British Parliament in Jan 1999 if you want to look it up).
The mass displacement of people (called 'genocide' at the time by a warmongering Western press) did not happen until after the bombing started. This was also stated by the UK Commons Defence Select Committee after the 'war', at the same time that they confirmed that the attack had been illegal.
Not all Albanians wanted independence. It wouldn't have mattered if they had been 'proud to be Serbian' (the equivalent to your Mexican analogy where you pressume, probably rightly, that immigrants are 'proud to be American'). That would be usual for a group of people who had chosen to live in another sovereign state. The point is that hardliners in what became the Western-backed KLA stoked up violence, hatred and terrorist separatist activities. That can happen anywhere in the world, even on your own doorstep.
The British troops in Northern Ireland have been clamping down on IRA terrorists over decades, and nobody threatened to bomb Britain unless they handed over the territory. Another very similar analogy.
By the way, do you know how many Albanians in Kosovo have been tortured, murdered or beaten by the KLA because they were seen as 'collaborators' or because they refused to join the KLA? There were thousands of innocent people, Serbs, Albanians, Roma, who were terrorised or killed by these thugs after the so-called liberation.
Kosovo is in a mess - it is run by gangsters who trade in people, guns and drugs. They are causing a major headache and rise in crime throughout Europe.
Elsewhere in Serbia, people are poor and things are very tough. There are Albanians living peacefully in Belgrade, but not a single Serb living peacefully in Nato's 'multicultural' Kosovo, even though it remains in their own country.
Finally, let's just remember that Resolution 1244 allowed for the return of Serbian troops and police to the province of Kosovo. This is not something which has come out of the blue. It was agreed by the UN and Nato. Why is it that so many people can't see this situation away from the political line spewed out? Serbia was never a threat to any other country - it only refused to lose its independence and provided a good non-aligned, non-threatening target for Nato to reassert itself in its 50th year. The whole thing could have been sorted out peacefully after the Serbs signed the Paris peace agreement which specified that UN, and not Nato, troops would be allowed into Yugoslavia.