Because since, some years ago now, the 60% super-majority was eliminated for school district Maintenance and Operations (M&O), coupled with these special elections held as stand-alone ballot measures, it's very easy for these to pass, no matter how much they are asking. Four years ago, for example, they literally DOUBLED the tax rate, and, as you stated, this year was "replacement + an increase".

I am not sure what this has to do with the NASWI: everyone who owns property pays property taxes, and, for those who live in Federally owned housing, the school district receives Federal Impact Aid. Plus, at least one local public school actually sits on Federally owned land.