To me, it sounds like they're terrorists simply because they're separatists.

Imagine if Canada considered separatist Quebecois as terrorists (yes, an infinitely small few were, but the vast majority just want a referendum)

You know what the Indian Hindu majority and their media doesn't seem to consider terrorism? Pogroms against Sikhs, or Muslims.

So... that should tell you something.

Highjacking and bombing aeroplane, attacking people opposing their POV, bombing in general, killing of prime minister.

Your Western biased ignorance forgiven.