Stirring up shit for Russia. Next level.
Imagine that NATO did not increase manning, and the White House did not mention the troop build up. The headline now reads "Serbian troop massing on border, NATO says 'don't worry about it'". Bad look for NATO, and maybe makes future bullshit more likely.
Yes, nuclear genocide is indeed quick, but not super viable. Even the limited air strikes in 1999 took months, and pretending it wouldn't all be a diplomatic and military distraction is just silly.
If you don't use nukes, it's at least months of airstrikes. A ground operation would be even slower, and bloodier.
other commenters in this thread display much more nuanced and informed perspectives.