Die Hard is not exactly about Christmas
It is about a family in trouble coming together for the holidays to heal a rift. Along the way, there are ups and downs that the family must work through together. Various characters have a role to play in the healing process, and they too learn some important lessons about how precious life is. In the end, the family does come together in time to celebrate a joyous Christmas. Die Hard is not a traditional Christmas movie, but it definitely has many of the themes present in a Christmas movie. Now, if McClane went to Nakatomi to rob the party goers and found himself in a gunfight with terrorist/thieves, then that would be an action film.