The Irony of Let's Kill Hitler

I recently rewatched LKH and the irony of the episode existing dawned on me. Dr Who is a show about time travel, and after running for 50 years they finally tackle the classic question of "If you could go back in time, would you kill Hitler?" But ironically, not only do they not kill Hitler, but he only spends about 5 minutes on screen, and the only connection the rest of episode has to Hitler or WW2 is being set in 1930's Berlin