I wonder why such laws exist when someone, who can afford solicitors who know these quirks, can avoid paying tax versus someone who does not have as much money

I wonder why such laws exist when someone, who can afford solicitors who know these quirks, can avoid paying tax versus someone who does not have as much money to do such setup has to pay. Laws should have equal effect on the poor and the rich, so why German people don't demand that this is wholly scrapped? Either everyone should pay tax or no one* (the poor shouldn't pay tax).