They were peasants.
Then, over the course of about 200 years, some of these gentry got their heads chopped off or were stripped of their papal lands or were rounded up and put in front of a firing squad and thrown down a well.
But there were still plenty of gentry left, and so a deal was struck: we (the peasants) get old age pensions and some trifling property ownership and a handful of other "benefits" and protections, and you get to retain the landed class privileges you've constructed and ... we promise not to chop your heads off.
Ok, deal.
The european social model is not the result of sophisticated empathy and communalism. It's a deal made fair and square - you stop treating us like cattle, and we won't revolt and murder you and your children.
But there's a converse to all of this ...
What if a population was not systematically enslaved and disenfranchised for, oh, say, 2000 years ? What if there is not an intricate system of landed class and privilege and you build the social and welfare state first ?
The deal still gets made, it just gets made in reverse.
You want cradle to grave welfare and benefits ? Fine. These folks over here will give it to you (the money has to come from somewhere, after all) but they will absolutely assert a system of privilege and class benefits. You won't like it. It's "unamerican". Those consequences will be unintended, but there's no way to leave that equation out of balance.
After all, a deals a deal.