We should understand that there was a qualitative difference in approach towards the Soviet Union/Russia on the one hand, and Yugoslavia on the other. Anything was (is) good to undermine the power the former, to go against Milosevic took a little bit of Clinton and a lot of Albright, especially in the case of Kosovo. She is of Czech origin and just hates the guts of those Stalin-like figures.

The singularity of the Kosovo case goes much deeper than you thought. We concur: hardly something that Catalonia could compare herself to.

Some of the reasons behind the Non-Aligned Movement are noble and in keeping with what many independence movements would like to see.
It is not lost to me that it was started in Belgrade either.

I will still re-iterate what I initially stated in a more detailed manner. In my view, however you want to take it, the US views the entirety of Eastern Europe and its’ subsequent disintegration and move towards democracy as proof of the mistake that was communism. There is thus an underlying tendancy for the US to support independence movements that re-affirm this. Serbia was where the communist power in Yugoslavia was centered, and so by default it is the country that is now demonized since Yugoslavia broke apart into its’ historic, (and maybe non-historic nations).
It is almost a knee-jerk reaction for the US to stand by Kosovo in its declaration for independence. This is what I meant, maybe in not as much detail, when I stated that Catalunya connot count on this type of support from the US.

Is there a trap #3 that I should be expecting?

You could have wondered why I mentioned Yugoslavia and then you could have decided to read a bit about it. Usually people don’t see that rather positive element, and get caught. The trap works fine because it is based on elements of the human psyche.

Now let me say it directly: you could read a bit about Yugoslavia and the Non-Aligned Movement.

Warning: This is trap #2.