That's because they make so little money that paying taxes would impact their ability to feed themselves.

This comes up just enough I wonder - are there really people that wish to revoke citizen privileges because you don't earn enough money?

Well, that is just silly. Median americans have income several times higher than e.g. median people in central/eastern Europe (not to mention third-world countries) even after correcting for different price levels, and even these are able to feed themselves.

Here in Czechia income tax breakeven is roughly on minimum wage. Above that (almost everyone who has fulltime empolyment) people pays some income taxes.

This is a deplorable view and I'm not surprised you made a whole new throwaway account seemingly for the purpose of making it.

Indian castes aren't based on merit though.

Earning sufficient income to be eligible to pay federal taxes is not based on merit either.

It could be. With equality of opportunity it's the same.

Religious or genetic castes will never be.