From a reader:

We must once again bow to the master. As with every other ridiculous thing we see today, W. S. Gilbert deflated the notion of genetic predisposition to political positions.
In Iolanthe, Private Willis, on guard before the Houses of Parliament, muses that
I often think it’s comical–Fal, lal, la!
How Nature always does contrive–Fal, lal, la!
That every boy and every gal
That’s born into the world alive
Is either a little Liberal
Or else a little Conservative!
Fal, lal, la! . . .
Then let’s rejoice with loud Fal la–Fal la la!
That Nature always does contrive–Fal lal la!
That every boy and every gal
That’s born into the world alive
Is either a little Liberal
Or else a little Conservative!
Fal lal la!