As for why there aren't more classes about helping low-income taxpayers comply or pay less tax--it's because we have a progressive tax system. If you don't make a lot of money, you don't pay a lot of tax, and the tax laws that cover you aren't that complicated (perhaps with the exception of complying with law regarding the EITC).
If I suggested there should be more tax courses for the poor, I did not mean to. Whatever would help the poor and most middle classers is covered in a basic course. The reason such a program would make little sense, as the commentator suggests, is that there would be little demand for tax advice. In fact, the demand for tax advice is directly related to the money at stake.
If poor and middle class people do not demand tax advice and if there are no positive externalities that accrue to them by virtue of the advice given to the relatively wealthy and corporate clients, why should they be asked to cough up anything at all to support an LLM program? In effect, the subsidization of LLM tax programs by all classes results in a redistribution from lower income to upper income classes. So much for a progressive tax system!