i think their entitlement largely comes from the fact that they were one of the few generation who actually had very prosperous lifes (things getting better after the war but still no shitty wages we see today) so obviously (to them) they must have done something right. And that's why they try to share their great way of life (and doing things the right way) with everyone else, so everyone else can live a prosperous life too.

Problem is, their life wasn't good because of what they did. It was good because they met exceptional circumstances in the world's development where there was a lot of growth and innovation that actually improved people's lifes. they just happened to live through it; it's not their personal achievement.