Religion and ties to one's own nationality are less, for good or bad, since then.
Who would the young people be fighting for? For some lifelong unemployed 60 year olds with hatchet faces who scour Poundland and B and M? Fighting on behalf of some 18 year old ultrawoke student in an ivory tower who enjoyed a gap yah in Kenya?
For a billionaire prime minister who looks like he'd regard a paper cut as a war wound?