While it certainly didn't help, that background had far less influence, bad enough as it was (some of us remember Empire Day lessons at School) than the daily propaganda versions of historical events in the printed media, and allegedly Historically accurate moviesFood for thoughts this morning:
quote
Many Britons believe the empire was a good thing. A 2014 YouGov poll of 1,741 people across Britain showed 59% felt the empire was something to be proud of and only 19% thought it was something to be ashamed of. Almost half the respondents felt the colonies were better off for being colonised; only 15% felt they were worse off.
end quote
https://www.theguardian.com/business/2018/mar/10/empire-strikes-back-why-former-colonies-dont-need-britain-after-brexit
the fault is clearly how history is taught in the UK.
History lessons are generally not so influential as this Daily drip feed of nonsense is.