This whole idea of taxing the rich is always well received by the masses but how are they going to do it? They can easily increase the amount that theoretically rich people will have to pay in taxes, but do you think they are going to sit down doing nothing while politicians pass this law? Of course not, they will use their influence to block such new taxes and even if they cannot do so they can modify the law enough to create holes in it and allow them to use those very same holes in the law to not pay those taxes, effectively making useless any attempt to tax them at an higher rate than what they are paying now.
In theory they say the riches are going to pay higher taxes, but in fact the middle class is the one going to be sacrificed, as always. The elites put the knife in government's and congress' necks and get all they want from them, but the middle class doesn't have the same *persuasion* power, while the poors (the masses) can't be charged by the state, as the leftwing needs their votes to maintain themselves ruling.
Leftists hate middle classes because they are the only independent force of a country, which built and conquered their patrimony by their own effort, it's the only class which offers resistance to government's abusive regulations and taxation policies.
That is what it always happens at the end, those that are poor cannot pay taxes and those that are rich are never going to pay the taxes they are due, so all falls on the middle class because they have too much to lose but not enough to avoid those laws, the problem is that sustaining a country by charging huge taxes to such a small section of the population is a big problem in itself because the bigger the taxes the bigger the amount of people that stop being middle class and become poor creating a vicious circle that eventually leads to a huge crisis as governments are unable to sustain themselves anymore.