Clearly you know little of the US armed forces and their motivation to fight what was a clear and present danger in Iraq as opposed getting involved with the destruction of a fellow European country in violation of the Helsinki accords. The European forces were ostensibly brought in as peace keepers, not as a fighting force and have not even been effective in keeping Serbian churches from being destroyed. If they are not motivated to keep the peace, there is little reason to believe they would be motivated to go into combat.
No K-Force troops have done anything to prevent Albanian violence against the Serbs and Serbian cultural institutions so even in an imperfect world there has been no effort made to prevent violence. Your analogies to Iraq and Afghanistan do no stand up as the vast majority of areas in those countries are pacified precisely because of the motivated actions of the US and our allies, many of whom are European. No one is speaking about preventing all violence but at least an effort should be made. As such, there is no reason to believe an effort would be made to fight against a determined foe in Kosovo.