Let me clarify, teachers do not know who they will have and if they have a specific list of items they would like to see students purchase to which parents would they give the list if they do not know which parents will need to purchase the supplies? As to basic supplies, well I do not think a teacher needs to tell anyone what is needed i.e. erasers, crayons, markers, etc.
I also love the people that think their taxes pay for everything. Taxes pay for staff in the classroom, text books, paper, and pencils.
Tax money gets more and more scarce now that computers are really a necessity in the classroom. When you think about maintainence, ink, and replacement costs... well that cuts into little niceities. The more technologically advanced our society becomes the more it costs for just basic classroom upkeep.