So there would be absolutely no problem if afghans or cubans bombed the US, right? Is it just the US that is allowed to basically do whatever it wants to a country based on whatever conclusion their spook agencies come up with?

Plus, as the other comment says there has been no proof that libya was involved. Going by a "hunch" or "secret info from our intelligence agencies" isn't evidence either. You should probably read up on the events, it was super controversial at the time so claiming it was just a cut and dry self-defense move from the US is laughable.