I think the aim of the article is to point out that at present...

I think the aim of the article is to point out that at present about half the national voters provide revenue to fund themselves and and the other half.

not entirely accurate.
there is no direct link to the taxes you and i pay and someone on welfare.
govt revenue comes from a number of sources, not just income tax, e.g. gst
public service workers should not have been included in this article - they pay their taxes too.
all revenue, yours included, is provided by someone else - your customers, or your employer, or the companies you are invested in ( yes i know, in exchange for products/skill/capital).
the point is an economy is an interconnected network.
the liberals in particular, see the economy as a morality play where the rich are to be rewarded and the rest are undeserving.
rather mediaeval somehow.