The poor too are taxed, the tax is not always in the form of you paying the government. The things you buy and the food you eat are taxed beforehand.
There's a high level of corruption in government. Anyone that gets elected to the government are approached by rich business that pays them and their parties a hefty sum to make policies according to their interest. The government don't really tax the ultra rich, they create loopholes for the ultra rich to not pay tax or compensate back the tax they paid on one way or other.
The government gets most of its revenues from the middle class and normal workers. And it benefits from not working in favor of them or the lower class. For someone to be rich, there should be poor people willing to work for cheap.
The taxes imposed by the government on the people are of course indiscriminate, the whole community certainly has to pay taxes if they want to get any goods, in this case it will be very detrimental to the people if they cannot benefit from what they have paid to the government.
A government that can be controlled with money really doesn't care about their society and all they think about is a group of people who can benefit themselves and if this continues of course a country will certainly be on the verge of collapse and as you said it is very true indeed. There are some people who have a lot of wealth, they falsify tax documents and do not fully pay taxes, of course this will be very detrimental to the country, but they can hide behind their wealth and they are also close to the authorities at that time.
Those who employ other people at wages below the average worker, of course they never think about their workers, they only use these workers to make money for them and we think this is really undesirable and these workers must be willing to do work for cheap pay. because there is no other choice that they can do.