They usually start as democrats to rebel against their parents. Later in life a lot of people turn conservative. But it doesn’t really matter if they do, since if they stay (or become) liberal they will have fertility well below replacement anyway.
(to be fair to swine, in the wild their litters are much smaller [4-6]; we've bred the domestic ones to produce so many young [9-13] that she can't feed them all. This is because on a farm the pigs do not breed for their own benefit, but for the farmers')
To rebel. Also because young people have less life experience and are therefore more gullible. 15-20 years into their adult lives they begin to see that the government is useless and wasteful and exists primarily to serve itself. They also begin to think about who’s going to pay $36T the Fed printed so far, or why we spend trillions abroad while our infrastructure is crumbling and healthcare and education costs are going up exponentially. And so on and so forth - those are the kinds of things a virtue signaling twenty something does not concern themselves with.
Huh. I thought all my mid-to-late thirties friends and I were intelligent, experienced, and well-informed voters, but it turns out we were simply rebelling against some nebulous status quo. Now that we know better, guess we’ll have to vote in that repugnant fascist and his sycophants. Surely our lives will be improved by the party of “““small government””” and their world-renowned intelligentsia.