~Why does Britain glorify its violent past?

https://www.theguardian.com/commentisfree/2018/may/29/britain-glorify-violent-past-defensive-empire-drug?utm_source=esp&utm_medium=Email&utm_campaign=Opinion+UK+connected&utm_term=276475&subid=13614502&CMP=ema_opinionconnectuk

Extract

“It feels like I live in the middle of a culture war. On one side is a kind of state-sponsored amnesia. It’s pervasive. It’s an Oscar-winning movie perpetuating the idea that Winston Churchill stood alone, at the Darkest Hour, as Nazi fascism encroached, with Britain a small and vulnerable nation isolated in the north Atlantic. In reality the United Kingdom was at that moment an imperial power with the collective might of Indian, African, Canadian and Australian manpower, resources and wealth at its disposal.”