So, why don't they tax the poor who barely struggle to eat?:Simply because they found those set of citizens useless and the prison will be occupied if charge them for not paying taxes since there are more Poor people than the rich in the society.
Do you think it is the rich that are paying for your taxes, the poor are those paying more taxes, you're paying for yours and that if the rich. You get taxed more when you buy things in retails because all the business are adding their taxes and they add prices to the goods being sold and when you buy things, you're paying more but the rich buy in whole sales, the discount you get would make your expenses to be reduced.
The rich has ways they use to avoid taxes but the poor man aren't allowed such privileges so they are the only ones the government can suck dry for their taxes. The government will make it to look like everybody is receiving equal taxes but in reality the poorer you are the more taxes you pay. The money might be small in your eyes but when you consider the percentage you're paying in comparison to the money you have but the rich is paying less and left with more wealth.