Brits who defend British imperialism are much like hicks in America
The hicks in America are basically the same as brits who defend their own country's imperialism. Both are white, uneducated, have crap jobs, fiercely patriotic, conservative, never seen actual combat in their lives (chickenhaws). Their arguments are also corrupt and laced with logical fallacies mostly due to their lack of a formal education.
I suspect these people have little power in their own lives, so they grasp on to the power (or former power) their own country has and covets it as their own, that's why they support such atrocities.