Maybe the problem is that in the US, most of the money in our school systems goes into facilities (athletic and academic), techonology (laptops and ipads), etc. while countries with good education programs spend their money on the staff.
I would say the greatest evil is technology.
facilities - you've got to have allotment for each student in a suitable work environment
but technology...my mom, 4th grade teacher in MHK, has probably $10,000+ worth of tech in her room. teachers just got ipads. not sure why. she doesn't know why. just to "keep up" with the evolving ways of education i suppose. so that's $10000 in goods, plus another $5000 probably in software, upkeep, power, replacement parts etc. per classroom, so: 15,000*3(teachers per grade, roughly, in MHK)*7(K-6)*8(elem. schools in USD 383)=around $2.5 mil, just for the elementary classrooms. add in computer labs, libraries... plus middle and high school, and i can see where our biggest problem is.
I don't want to make it seem like we need to trash computers and go back to slates, but we need to use technology more efficiently. don't give Mrs. AboutToRetire an iPad she does not need. don't do things like buy an elmo for each room. i don't know.
now, there ARE schools which use this technology efficiently and appropriately, but so many teachers are just not educated enough on the integration of technology that it just goes to waste, and therefore that is basically burning tax dollars.